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Acknowledgments |
ACKNOWLEDGMENTS
Stephen J. Baskauf
Kattie Hansen, Bio 406d and the Plant Resources Center, University of Texas at Austin
Illinois State Museum
Timothy D. Ives
Susan McDougall, USDA Plants Database
Gary A. Monroe, USDA Plants Database
J.E. Peterson, U.S. Department of Agriculture
Plants Database, U.S. Department of Agriculture
Sten Porse
Walter Siegmund
United States Fish and Wildlife Service
United States Forest Service
Rick Wallace, U.S. Department of Agriculture
Charles Webber, California Academy of Sciences
Special thanks go to Dr. Charles Webber of the California Academy of Sciences for the use of his magnificent photos of California conifers.
The line drawings are, for the most part, from:
Sargent, C.S. 1922. Manual of the Trees of North America (Exclusive of Mexico). Volume 1.
Many of the verbal distribution descriptions are taken from:
Silvics of North America. R. M. Burns and B. H. Honkala eds. Agriculture Handbook 654, in 2 volumes. U.S. Department of Agriculture.
Distribution maps are modifications of the range maps to be found at the web site:
Atlas of Relations between Climatic Parameters and Distributions of Important Trees and Shrubs in North America. Robert W. Thompson et al., U.S. Geological Survey.
