vi Acknowledgments The authors and publisher would like to thank the following individuals and associations for their valuable input in the development of Natural Resources Systems. In addition, the authors would like to thank their family and friends for their support in this endeavor, as well as their colleagues and key industry contributors for their valuable input in the development of Natural Resources Systems. Robert L. Anderson, USDA Forest Service Dr. Robert G. Bailey Jim Barborak, Colorado State University Scott Bauer, USDA Agricultural Research Service Susan Berescik Brett Billings, USFWS Michael Bohne, USDA Forest Service Ty Bowgren, Wagner Lumber Bugwood.org Bureau of Land Management Mark Cantrell/USFWS William M. Ciesia, Forest Health Management International Clemson University – USDA Cooperative Extension Slide Series Tom Coleman, USDA Forest Service Commission for Environmental Cooperation, US EPA Jack Cook, USGS Ric Coombe, Thunder View Farms Eric R. Day, Virginia Polytechnic Institute and State University Joy deVries, USGS Environmental Conservation Online System (ECOS) Dave Fogarty, Forestry Suppliers Forestry Suppliers, Inc. George Gentry, USFWS Georgia Forestry Commission John Ghent, Bugwood.org Laura Greiner, USDA NRCS Ryan Haggerty, USFWS Jessica Heitt, Nevada Department of Wildlife Steve Hillebrand, USFWS Glen Hush, USFWS Lacy L. Hyche, Auburn University Andy King, USFWS Theodor D. Leininger, USDA Forest Service Library of Congress Matt Lohr, NRCS Tess McBride, USFWS Tim McCabe, USNRCS David McComb, USDA Forest Service Minnesota Department of Natural Resources P. Nadeau, USGS National Aeronautics and Space Administration (NASA) National Emissions Inventory, EPA National Oceanic Atmospheric Administration (NOAA) National Wildlife Health Center, USGS Ron Nichols, USNRCS Joseph Obrien, USDA Forest Service Matthew Olson, USNRCS Evan Patrick, Olmstead Park System Terry S. Price, Georgia Forestry Commission Charlie Rahm, USNRCS Shawn Sanders, USFWS Pamela Ann Sexton, USGS Kim Shifl ett, NASA Fraser Smith, Forestry Consultant