1. Anonymous, 2000. Forest Insect and Disease Conditions in the Southwestern Region, 1999. R3-00-01. USDA Forest Service, Southwestern Region, Albuquerque, New Mexico. .
2. Anonymous, 2005. Utah Forest Insect and Disease Conditions Report 2002–2004. R4-OFO-TR 05-12. USDA Forest Service, State and Private Forestry, Forest Health Protection, Intermountain Region and State of Utah Department of Natural Resources Division of Forestry, Fire, and State Lands. .
3. Anonymous, 2009a. Ecological Regions of North America. A Revision of: “Anonymous. 1997. Ecological Regions of North America: Toward a Common Perspective. Commission for Environmental Cooperation, Montreal, Quebec, Canada”. Commission for Environmental Cooperation, Montréal, Québec, Canada. and .
4. Anonymous, 2009b. Federal Forest Health Highlights for 2009. Minnesota Department of Natural Resources, Forestry – Forest Health Unit. .
5. Anonymous, 2009c. Wisconsin Forest Health Protection Annual Report 2009. Wisconsin Forest Health Protection Program, Division of Forestry, WI Dept of Natural Resources. .