1. Tree Ring Laboratory; Lamont-Doherty Earth Observatory; 61 Route 9W Palisades NY 10964 USA
2. Department of Forest Resources; University of Minnesota; 115 Green Hall 1530 Cleveland Avenue North St. Paul MN 55108 USA
3. Department of Geography; Ohio University; 122 Clippinger Labs Athens OH 45701 USA
4. Harvard Forest; Harvard University; 324 North Main Street Petersham MA 01366 USA
5. Department of Geography; Northern Illinois University; 1425 West Lincoln Highway DeKalb IL 60115 USA
6. Department of Geography; University of Alabama; 204 Farrah Hall Box 870322 Tuscaloosa AL 35487 USA
7. Department of Geology and Geography; West Virginia University; Morgantown WV 26506 USA
8. U.S. Forest Service; 359 Main Road Delaware OH 43015 USA
9. U.S Geological Survey; DOI Southwest Climate Science Center; 1955 E. 6th Street Tucson AZ 85719 USA
10. Department of Geosciences and School of Natural Resources and Environment; University of Arizona; Tucson AZ 85721 USA
11. Institute of Terrestrial Ecosystems; ETH Zürich; CHN G 63 Universitätstrasse 16 Zürich 8092 Switzerland
12. Department of Plant Biology; Ohio University; Porter Hall 315 Athens OH 45701 USA
13. Department of Biology; University of Dayton; 300 College Park Dayton OH 45469 USA
14. Department of Forest and Wildlife Ecology; University of Wisconsin-Madison; 1630 Lindend Drive Madison WI 53706 USA
15. Department of Geography; University of Georgia; 210 Field Street Athens GA 30602
16. Department of Geology and Geophysics; University of Wyoming; 1000 East University Avenue Laramie 82071 WY USA
17. Department of Geography; University of Wisconsin-Madison; 550 North Park Street Madison WI 53706 USA