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Eastern Hemlock

Latin name:
Tsuga canadensis

Extracted from a waterfront pier near Wilmington, Delaware, the tree used to make this portion of the pier
actually came from a forest located in central Pennsylvania. The outermost tree ring dates to the late 1830s.

Giant Sequoia

Latin name:
Sequoiadendron giganteum

A close up of numerous fire scars on a giant sequoia cross section from Sequoia National Park in California, dating back well prior to A.D. 1000. Look closely! Can you find the sad bearded face cradled by his hands, as if he was crying?

Douglas-fir

Latin name:
Pseudotsuga menziesii

This photo shows the tree rings from a beam extracted many years ago from a pueblo in northeastern Arizona. The section shows many false rings and many micro-rings, suggesting this tree may have been growing in a marginal environment.

Ponderosa Pine

Latin name:
Pinus ponderosa

Close up of tree rings of a ponderosa pine collected at El Malpais National Monument in New Mexico, USA, showing tree rings centered around A.D. 1400. Notice the variability in ring widths indicative of sensitivity to year-to-year variation in precipitation.

Douglas-fir

Latin name:
Pseudotsuga menziesii

Perhaps my most requested image of tree rings, obtained from a small Douglas-fir growing in the Zuni Mountains of west-central New Mexico by my colleagues Rex Adams and Chris Baisan. Not very old, but has some of the most beautiful rings of all my displays!

White Oak

Latin name:
Quercus alba

Oak cores from the Hoskins House in Greensboro, North Carolina, site of a famous battle during the Revolutionary War. The house was built from trees cut in 1811 to 1813, not cut and built in the 1780s as the historical agency had hoped.

Ponderosa Pine

Latin name:
Pinus ponderosa

This ponderosa pine once grew at El Morro National Monument in New Mexico, USA, and was cut many years ago. Once you get up close to the stump, you can see a very old scar from a fire many hundreds of years ago that scarred the tree when it only about 12 years old!

Bahamian Pine

Latin name:
Pinus caribaea var. bahamensis

We collected many cross sections of Bahamian pines that had been cut for an industrial park on the island of Abaco, but the rings are very difficult to date! Many false rings, and the pine appears to terminate tree growth during the dry season.

Longleaf Pine

Latin name:
Pinus palustris

This cross section was one of many that came from an old crib dam across a creek that was exposed after a modern dam broke in Hope Mills, North Carolina in 2003. Such sections from old-growth longleaf pines are very rare and provide information on climate back to AD 1500!

White Oak

Latin name:
Quercus alba

Sometimes you don't have to look far to find beauty in wood, and sometimes it may not be a living tree! After an oak tree was cut a year or two before this section was obtained, decay fungi had already set in, beginning to break the wood down to its basic elements.

Southwestern White Pine

Latin name:
Pinus strobiformis

I collected this fire-scarred pine on Mt. Graham in southern Arizona in fall 1991, and it remains one of the best examples of how we can determine the season of fire by looking at the position of the scar within the ring.

Bristlecone Pine

Latin name:
Pinus longaeva

Bristlecone pines have become one of the best proxy records for those who study the history of volcanic eruptions because the cool temperatures caused by these eruptions create "frost rings" that form when the cells implode from the cold.

Eastern Redcedar

Latin name:
Juniperus virginiana

Many well-preserved eastern redcedar sections have been recovered from prehistoric sites in eastern Tennessee, and they have more than enough rings to date, but we don't have a long enough living-tree reference chronology to overlap with them!

Red Oak

Latin name:
Quercus rubra

Oak is by far the most common genus we find in the many historic structures we date using tree rings in the Southeastern U.S. The genus has good ring variability and rarely has problem rings. This section came from a historic tavern in Lexington, Virginia.

Sugar Maple

Latin name:
Acer saccharum

Maple, birch, beech, and basswood are all examples of hardwood species that form diffuse porous wood, meaning that the ring contains many small-diameter vessels all through the ring. Identifying the ring boundary on this wood type is a challenge to tree-ring scientists.

Live Oak

Latin name:
Quercus virginiana

Live oak is an example of an evergreen oak, which is not common within this genus. As such, the wood is semi-ring porous and the rings are very difficult to see and date. Ring growth is also very erratic, not forming the concentric around the tree that we require.

Douglas-fir

Latin name:
Pseudotsuga menziesii

These cores were collected on Mt. Graham in southern Arizona and show a major suppression event beginning in 1685 when missing rings became evident, followed by many micro-rings. This suppression was caused by a major wildfire in 1685!

Ponderosa Pine

Latin name:
Pinus ponderosa

I find it amazing what trees can record in their tree rings! Here we see a cross section of a pine that was damaged by a major flood in the year 1945 in the Chiricahua Mountains of southern Arizona. Notice the reaction wood that formed afterward.

Pignut Hickory

Latin name:
Carya glabra

Sometimes gray-scale imagery helps define tree rings when measuring. Although classified as "ring porous" species, the rather ill-defined tree rings in hickory tree species form large earlywood vessels and smaller latewoood vessels.

Subalpine Fir

Latin name:
Abies lasiocarpa

Decay has set in on the tree rings of this dead and downed subalpine fir that once grew on Apex Mountain in British Columbia, Canada, but the tree rings can still be measured and crossdated despite this!

White Fir

Latin name:
Abies concolor

We found a beautiful fire scar on this white fir that was used to build a cabin in the Valles Caldera of New Mexico. Thought to have been built in the early 1900s, we instead found the cabin was built form white fir and Douglas-fir trees cut in 1941.

Overcup Oak

Latin name:
Quercus lyrata

These oak cores were collected in northeastern Arkansas to investigate a change in the hydrologic regime of a wildlife refuge beginning in the 1990s. We found that trees at this site experienced a major disturbance event in the 1960s.

Western Juniper

Latin name:
Juniperus occidentalis

Near Frederick Butte in central Oregon, we discovered an unusual stand of western junipers that had the most unusual lobate growth forms we had ever seen. This site yielded a drought-sensitive chronology dating back to the AD 800s!

West Indies Pine

Latin name:
Pinus occidentalis

Above 3000 meters on the highest peak in the Carribean, we found an entire forest of these pines, many with fire scars, living on a steep rocky slope. The forest looked more like the dry ponderosa pine forests of the western U.S.

Whitebark Pine

Latin name:
Pinus albicaulis

Whitebark pines growing in the northern Rockies of the western U.S. can grow to be over 1,000 years old, but the species is slowly being decimated by the introduced white pine blister rust. Many of these ancient trees are now dead with ghostly white trunks.

Shagbark Hickory

Latin name:
Carya ovata

Curiously, tree-ring scientists rarely analyze some of the more common hardwood species in the eastern U.S., such as this hickory, perhaps because such forest interior trees may contain a weak climate signal necessary for crossdating.

Virginia Pine

Latin name:
Pinus virginiana

Blue stain found in many sections of dead pines (both in the western and eastern U.S.) is caused by a fungus carried by a pine beetle. The fungus spreads into the phloem and sapwood of living and dead pines, sometimes creating stunning patterns!

Pinyon Pine

Latin name:
Pinus edulis

Burned sections of pinyon pine are commonly found in archaeological sites in the southwestern U.S. These sections can be carefully broken or surfaced with a razor to reveal the ring structure inside to assist in dating the years of construction of the site.

Red Spruce

Latin name:
Picea rubens

Conifers in the highest elevations of the Appalachians of the eastern U.S., such as this red spruce, don't experience wildfires very often, but when fires do occur, they can create numerous fire scars even in this fire-intolerant species. Notice the growth release!

White Spruce

Latin name:
Picea glauca

This tree was located in the Canadian Rockies on the toe slope of an active avalanche path. The scar was created by a debris flow or snow avalanche which struck the tree, killing a section of the living tissue. The avalanche can therefore be dated to its exact year!

Engelmann Spruce

Latin name:
Picea engelmannii

I worked considerably in the spruce-fir forests of southern Arizona in my earliest years in dendrochronology, and learned that trees with limited sensitivity can provide a vast amount of information on the history of these forests.

Pondrosa Pine

Latin name:
Pinus ponderosa

The lava flows of El Malpais National Monument in New Mexico contain vast amounts of remnant wood, mostly ponderosa pines such as this sample, and the tree rings on these samples go back nearly 2000 years! Notice the year AD 1400 on this section.

Chestnut oak

Latin name:
Quercus montana

In the southeastern U.S., hardwood species are often scarred by wildfire. Most often, this also will cause considerable decay in the sample, but this oak had several well preserved fire scars, suggesting fire was common in these drier, lower elevation sites.

Pondrosa Pine

Latin name:
Pinus ponderosa

I originally sampled this stump in 1991 for its fire scars, located in El Malpais National Monument of New Mexico. I found it again 20 years later and was happy you could see the tree rings and fire scars clearly! It had originally been logged in the 1930s!

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  1. "Thank you for all the nice pages, new literature etc you made available for the rest of us!"
    - Maarit Kalela-Brundin, Swedish University of Agricultural Sciences, Umea, Sweden

  2. "Great job Henri!!! Keep on loving this subject - it is my favorite as well!"
    - Viktoria Gaydarova, Bulgaria

  3. "I love your work. I'll use it with my students. Thanks!"
    - Jeff Dudley, St. Paul's Middle School, Maryland

  4. "Thanks for the help!"
    - Paul Marlow, Wilmington, North Carolina

  5. "Thank you for your easily accessible information!"
    - Susana Sanderson, California State University, Chico

  6. "Thank you because I have gotten a lot of information about this topic for a very important paper."
    - Kelly Girard, S.U.N.Y. Cortland, Jeffersonville, New York

  7. "The pages you prepared are very informative. Thank you very much for preparing such useful pages."
    - Dr. Recep Efe, Department Of Geography, Fatih University, Istanbul, Turkey

  8. "I just retired in June and to keep myself busy by doing an environmental science class online, a whole new world for me, and happened into your website looking for climate information and global warming. A nice visit, thanks."
    - Dick Dodge, The Human Environment, Ridgecrest, California

  9. "Very interesting subject - I've been fascinated by the immense age of some white cedars discovered in Ontario as determined by their tree rings."
    - Marion Brown, Tucson, Arizona

  10. "Your web site is very beautiful and educative. I look to this page to find more knowledge about the trees because I don't know the names of the trees very well that I saw when I was trekking."
    - Gokhan Caglayan, Turkey

  11. "Just to say I think you have an excellent site. You have clearly put a great deal of effort into it and I much appreciate the fact. So much on the WWW is superficial and not updated. I feel there will be UK interest in the site and for once I agree with the blurb - it seems the ultimate dendrochronology site!"
    - John Morgan, The Royal Forestry Society of England, Wales and Northern Ireland

  12. "A nice, useful summary of dendrochronology."
    - Robert Ott, Fairbanks, Alaska

  13. "Your site is very very helpful for everybody (like me) who works on dendro. Thanks."
    - Silvio Borella, University of Bern, Switzerland

  14. "This looks like a good resource for my archaeology students. Thanks. I actually learned about your website from a newspaper."
    - Margaret Houston, Laurinburg, North Carolina

  15. "Thank you so much! You had exactly what I was looking for. You made my project so much easier."
    - Juliet

  16. "Greetings - I am delighted by the quality of your web site. Keep up the good job!"
    - Jean-Robert Thibault, Sylva WorldWide Web, Quebec, Canada

  17. "Provided me with a more in-depth understanding to a topic discussed only briefly during lectures."
    - Shelley Davis, University of Toronto, Canada

  18. "I find it just great that you sacrifice your precious time for your truly helpful and comprehensive dendro home page. Thank you very much indeed!"
    - Urs Weber, Institute of Botany, University of Basel, Switzerland

  19. "I really appreciate ALL your help and also HOW QUICK you responded!"
    - Talawna Sukovaty, Ames, Iowa

  20. "I was glad to see that I wasn't the only one interested in the subject. I've just started my Bachelor in Geography. Dendroclimatology is a field that truly interests me. I was using your site as part of a personal research on the subject. It was very useful... I just might pass again."
    - Catherine Bergeron, Peace River, Alberta, Canada

  21. " I enjoy reading your page, and learned a lot about dendrochronology. In fact I am very interested in this subject, and I have collected some samples from a natural reserve in northeast China."
    - Qi-Jing Liu, Center for Environmental Remote Sensing Research, Chiba University, Japan

  22. "Your Web site is being recognized with the Dr. Matrix Award for Science Excellence from "Dr. Matrix' Web World of Science." "The Ultimate Tree-Ring Web Pages" is also being honored with prominent display as a select site in the categories Biology & Evolution and Student Resources. Sites receiving this award are distinguished by the quality of their content alone. This award doesn't go to "cool" sites. It goes to the great sites."
    - Dr. Matrix' Web World of Science

  23. "Gratificant, molt interessant. De Barcelona, salutacion!"
    - Antoni Freixas Masana, Barcelona, Spain

  24. "Thanks for providing such an informative site! We are developing a tree ring lab for our non-majors environmental science course - the site will be really helpful."
    - Allison Collins-Rainboth, Oshkosh, Wisconsin

  25. "Great resource for non-dendrochronologists like me. I placed a link to your page in one of my course web pages. The course is Evolution of Crop Plants (i.e. origin of agriculture)."
    - Paul Gepts, Department of Agronomy, University of California - Davis

  26. "Saw the write-up in Science; since I am an archaeologist working in the Southwest I am aware of some of your work."
    - Tim Kohler, Pullman, Washington

  27. "Very good work, Henri! It's amazing you've done so much work in these pages! I am going to download this information and send it to all my friends also."
    - Wanmei Ni, Tucson, Arizona

  28. "Congratulations on the mention in Science! That's quite a coup and you definitely deserve it."
    - Eva Riccius, School of Resource and Environmental Management, Simon Fraser University

  29. "Cool stuff! Thanks for all your hard work!"
    - Lisa Kennedy, Department of Geography, University of Tennessee

  30. "Cool site! Actually I found your URL in Science magazine (I work there) - I have a friend who does tree ring analysis in western Maryland, and I'll pass the web site along to him! Thanks!"
    - Suzanne Moore, Science Magazine, Washington, D.C.

  31. "Your pages are beautiful, exciting and fascinating."
    - Joan C. Bailey, Valdosta State University

  32. "Well done!"
    - Micheil MacThomhais, Silver Springs, Nevada

  33. "The ultimate site to find dendrochronology information on the web, in other electronic forms, and in print. From basic introductions to the field of tree ring research to in-depth bibliographies of specialized sources, this site is well-organized and extremely thorough. Resources available include references to fundamental texts and links to their publishers, links to other dendrochronology web sites and to bibliographic databases, information on software tools for the discipline, and job announcements. The site developer is Dr. Henri D. Grissino-Mayer, Assistant Professor of Physics, Astronomy & Geosciences at Valdosta State University, who did much of the work while he was at Laboratory of Tree-Ring Research, The University of Arizona, Tucson"
    - Flora Shrode, Electronic Green Journal, University of Tennessee, Knoxville

  34. "Very well organised site with many resources on this topic."
    - Clive Charlton, University of Plymouth, United Kingdom

  35. "Wow. A tree ring treasure chest of information. Terrific effort."
    - Rose Mecca, University of Ballarat, Victoria, Australia

  36. "I am a fifth grade teacher and I found your site while looking for info for my class about plants. It's pretty damn good, and very comprehensive, I must say. Too bad we're not on the net yet, because this is one site I would want my students to visit. Oftentimes, info on the web is either too complex, too hard to find, or just plain inadequate for my needs. Your site is really dandy. Keep up the good work."
    - Carol Holmes

  37. "Wow! You have been a really busy man! I'm impressed."
    - Jack D. Gilbert, Valdosta, Georgia

  38. "Outstanding! A real aid to eastern archaeologists like me."
    - Dennis B. Blanton, College of William & Mary, Williamsburg, Virginia

  39. "I finally got around to opening my August 7 Science today, and saw you'd made their NetWatch! Congrats. I knew you had a great and useful web page - good to see you get the recognition."
    - John Fleck, Albuquerque Journal, Albuquerque, New Mexico

  40. "Wow! I am getting interested in using longleaf pine ring-dating to reconstruct forest history on the coastal plains south of Tallahassee (Apalachicola National Forest). I will use both cores from old living pines, and timbers salvaged old buildings on the FSU campus. This is an offshoot of an ecosystem research project focused on red-cockaded woodpecker, fire and arboreal ants. Your website will be a big help to my budding interest. Thanks."
    - Walter S. Tschinkel, Florida State University, Tallahassee

  41. "I have been reading your excellent net pages on dendrochronology. I am a Scottish student who has just completed my undergraduate degree in Environmental Science at Stirling University in Scotland."
    - Grant Kennedy, Stirling University, Scotland

  42. "I would like to congratulate you on the growing popularity of your web site work. You deserve it!!!"
    - Fekedulegn Desta, West Virginia University

  43. "Congratulations on your web page publicity - it is well earned. I just wanted to add my moral support, as your web pages are great resources. I refer to them often for information from your bibliography to equipment resources for setting up a lab here. I would be at a loss without your web pages as a resource. Thanks for spending the time to set up these excellent pages."
    - Jim Speer, Department of Geography, University of Tennessee

  44. "I read about your web sight in the 7 August issue of Science magazine. Since my master's thesis was on reconstructing the depth of the Great Salt Lake using dendroclimatology, I was very interested in your site. You've done a great job, and I hope to spend some time 'browsing' in the future."
    - Bill Delehunt, Miami, Florida

  45. "Thank you very much for your efforts to do all these things."
    - Rosanna Fantucci, Montefiascone, Italy

  46. "Congratulations on having your web pages featured in Science. I certainly appreciate the effort you put into them and find them a valuable resource."
    - David J. Barclay, The University of Buffalo, Buffalo, New York

  47. "These pages have been designed by Henri D. Grissino-Mayer to be the ULTIMATE resource for information on tree-ring research. You can learn all about the basic principles of dendrochronology, visit the photo gallery, or check out the information on references, links, databases - even software for dendrochronologists!"
    - Mary Townsend, Suite 101, Amazing Trees Site

  48. "Congratulations Henri! Your pages are worth to be featured! I suppose the webmaster was mentioned in the article also. Well deserved!"
    - Pentti Zetterberg, The University of Joensuu, Finland

  49. "Congratulations!!!! I always thought your web pages are super and am glad to hear about this. We get Science and I will look for it."
    - Harold C. Fritts, Professor Emeritus, Laboratory of Tree-Ring Research, The University of Arizona, Tucson

  50. "Congratulations on the Science write up of the web pages."
    - Tom Swetnam, Laboratory of Tree-Ring Research, The University of Arizona, Tucson

  51. "Congratulations - another 15 minutes of fame!"
    - Rob Argent, The University of Melbourne, Australia

  52. "YOU deserve all the credit. Be sure that your Chair and Dean see the article because it puts you and Valdosta on the map in hyperspace. THANKS for all the good work."
    - Jim J. Colbert, USDA Forest Service, Morgantown, West Virginia

  53. "Just a quick note to let you know that your work on the web pages are deeply appreciated by many more people than you might imagine. You have made a wealth of information available to a wide range of people. I've always admired you as a real educator, a person willing to go the extra mile to "bring forth" new ideas to advance the science you most obviously love. Many of us are enriched by your work - it has truly made a difference for me. Thanks for all your effort."
    - Neil Brosnahan, Encinitas, California

  54. "Congratulations!! We always knew you had some great stuff in there, and now everyone else will as well!! What an honor to be recognized in Science!"
    - Peter M. Brown, Rocky Mountain Tree-Ring Research, Ft. Collins, Colorado

  55. "This is an unusual site that focuses on what the study of tree rings can tell about the past. This is called dendrochronology. Check this site out to learn basic principles of dendrochronology, and to view an outstanding photo gallery. I find this site particularly encouraging because the researcher must fight against Ankylosing Spondylitis which is a form of arthritis. This emphasizes the fact that even handicappers can make significant contributions in the field of horticulture."
    - Diana Peterson, Suite 101, The Enabling Garden

  56. "Thanks for your info on the web. It has been most helpful for research."
    - Joan Walby, Lawrence University, Wisconsin

  57. "Finally got around to checking out your web page and it's great."
    - Bob Brett, Snowline Ecological Consulting, British Columbia, Canada

  58. "All my grateful thanks for your impressive work with the Tree-Ring Web Pages and ITR Forum."
    - Frederic Guibal, Faculte des Sciences et Techniques de St Jerome, France

  59. "I think you have a great web page. Of the web pages I have seen, yours is one of the most impressive."
    - Linda Mutch, Sequoia National Park, California

  60. "Your web page is truly magnificent. Thanks for such a wonderful job."
    - Sergei B. Yazvenko, LGL Limited, Sidney, British Columbia, Canada

  61. "On this definitive site for researchers in the field of dendrochronology, Henri Grissino-Mayer of Valdosta State University, Georgia, has recently added a useful and practical list of tools for conducting field and laboratory research. In addition to a hypertext-linked list, the site includes helpful tips to help make the task of tree-ring dating easier. Back at the "Ultimate" webpage, users will find many interesting facts and beautiful images of ancient tree cross-sections, complete with question and answers. Examples of photos available include a New Mexican juniper dated to 256 B.C., a giant sequoia scarred from a fire in 1297 A.D., and images of tree-ring researchers at work."
    - The Scout Report for Science and Engineering

  62. "Tremendous web page with clear definitions and graphics for novices like myself."
    - Paul Lyon, DCS Corporation, Arlington, Virginia

  63. "I am currently perusing your web page, being blown away by all it includes! This is much bigger than I recall from my last visit a couple years ago."
    - Paul Krusic, Tree-Ring Laboratory, Lamont-Doherty Earth Observatory, Columbia University

  64. "What an amazing web site, and very well made."
    - Jonathan Susselmann, Philadelphia, Pennsylvania

  65. "Excellent web site and resource to good dendro information. Thanks!"
    - Wil H. Moir, USDA Forest Service Rocky Mountain Research Station

  66. "Wow. Henri, this is the most comprehensive web site I have ever seen. I just wanted to compliment you on the hard work you've put into this great resource. Thanks."
    - Andrew Czaja, University of Connecticut

  67. "Your web page was very helpful to me. I have been reading cores for about three years now, using an antique piece of equipment. We have decided to upgrade our equipment, and my boss and I found your "Supplies" page and related links to be extremely useful - thanks for the information."
    - Shea Wilson, College of Forestry, Stephen F. Austin State University

  68. "The Ultimate Tree-Ring Web Pages is an excellent site with many pictures, questions and answers, and links about tree rings."
    - The Elementary Science Program Homepage

  69. "I like very much your web-site where I discovered lots of information about dendrochronology."
    - Antonietta Rizzo, University of Bologna, Italy

  70. "You can't imagine how important your homepage is for scientific and general information on dendrochronology. I have been spreading this wonderful information to our students, hoping to increase interest in dendrochronology in Brazil. Again, congratulations and thanks for your initiative and efforts in increasing the dendrochronology family by your homepage."
    Mario Tomazello, Forestry Department, University of Sao Paolo, Brasil

  71. "Keep up the good work on your web site."
    - Daniel Miles, Oxford Dendrochronology Laboratory, England

  72. "I really got a lot information I needed. Thanks."
    - Peter Laut, Technical University of Denmark

  73. "An excellent work. I´m searching for information about dendrochronology and your web page is a wonderful place to learn about it. Congratulations."
    - Williams J. Leon H., Laboratorio de Anatomía de Maderas, Venezuela

  74. "Wonderful web pages. Many thanks for the effort."
    - Kim Iles, Nanaimo, British Columbia, Canada

  75. "Thank-you for providing such a comprehensive and informative website."
    - Gisele

  76. "Hey! Lots of good information. My daughter, a designer of websites found your site while developing mine. I've asked her to include yours in mine."
    - Tom Borden, Borden Memorial Forest, Ft. Collins, Colorado

  77. "Thank you for presenting such a remarkable set of Web Pages."
    - David L. Wood

  78. "I have referred all kinds of people to the tree-ring web pages for further information about tree rings, especially teachers. Tree rings make a great teaching tool and the web pages are wonderful!"
    - Edie Taylor, Department of Botany, University of Kansas

  79. "Your page and the data banks are really great and valuable!"
    - Martin Worbes, Ciencias Florestais, Universidade Sao Paulo, Brasil

  80. "Thank you for your information about dendrochronology. When I looked through your web pages, it was a great help."
    - Liang Eryuan, Institute of Botany, Chinese Academy of Sciences, Beijing, China

  81. "I liked this site a lot and will visit again."
    - Jean Trapani, Connecticut

  82. "First, I must say - a VERY impressive web page!"
    - Gary V. Swenson, US Army Corps of Engineers, Mississippi River Project

  83. "Fantastic resource for the budding dendrochronologist!"
    - Sam Nijensohn, Dartmouth College, New Hampshire

  84. "A well constructed and very informative webpage!"
    - Peter Leppert, CSIRO Forestry and Forest Products, Canberra, Australia

  85. "I learned a lot about dendrochronology from your web site. Keep up the good work. I am quite enthused about learning more of dendrochronology and you have given me a strong starting point. Thank you very kindly for your help and for taking time out to share information about your field, which you obviously love."
    - Joseph Wood Keller, University of Texas - Austin

  86. "Did you know that your pages are helping a pika researcher? I'm using them to learn about paleoclimatic data for the Great Basin. I'm trying to understand how variation in local climates within the Basin might have influenced the history of pika populations, some of which have gone extinct since the Wisconsinan glaciation. Thank you so much for putting your efforts on-line."
    - Chris Ray, University of California - Davis

  87. "It is great to have people like you organizing communication and information in such a brilliant manner."
    - Christian Wirth, Lehrstuhl Pflanzenoekologie, Universität Bayreuth, Germany

  88. "Thanks, as usual, for your great services to the community!"
    - Donald J. McGraw, Associate Provost, The University of San Diego

  89. "Your pages were very helpful to me as I had to write an essay on proxy data."
    - Janice McKinney, Glasgow, Scotland

  90. "I find your web site to be wonderful. Your site is one of the most informative and educational sites that I have ever visited. You are to be congratulated! Keep up the great work."
    - Michael Palmer, National Gallery of Art, Washington, D.C.

  91. "An excellent work!"
    - Michael Drexhage, Institut National de la Recherche Agronomique, France

  92. "I really enjoy your page and also learn a lot of from it."
    - Nora Martijena, Departemento Ecologia, CICESE, Mexico

  93. "Your web pages and e-mail have left me with a considerable interest in finding out more on dendrochronology and the lives of trees."
    - Jonathan C. Day, Langley Research Center

  94. "I'm working on a masters thesis at the Department of Forest Vegetation Ecology, Swedish University of Agricultural Science, Umeå, Sweden, about fire history in a Swedish boreal landscape. I've been using crossdating to date wood samples from Scots pine (Pinus sylvestris). I found your page very interesting and useful.
    - Erik Hellberg, University of Agricultural Science, Umeå, Sweden

  95. "Nice layout and information. Thanks for you work!"
    - Jim Marshall, Grand Rapids, Minnesota

  96. "I am writing a paper on dendrochronology and carbon-14 dating, and this has been particularly helpful! Thank you!"
    - Jennifer Franzmann, New Jersey

  97. "I had to do a report on tree rings. Your page was extremely helpful."
    - Frank Justice, Pennsylvania

  98. "I really enjoyed your web-page, it provides useful information about tree-rings."
    - Hugo Hidalgo, University of California - Los Angeles

  99. "Great source for references and helps to define the subject that you require elaboration on - saved me a lot of work! Thanks!"
    - Colin Kelly, Montreal, Canada

  100. "Your mega-site is totally amazing to me!"
    - June Julian, A World Community of Old Trees Website
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