SELECTED REFERENCES 



Agee, James K. 1993. Fire ecology of Pacific Northwest forests. Washington, DC: Island Press. 493 p. 



Bailey, Robert G.; Avers, Peter E.; King, Thomas; IVIcNab, W. Henry, eds. 1994. Ecoregions of the 

 United States (map). Washington, DC: U.S. Geological Survey. Scale 1:7,500,000; colored. Accompanied 

 by a supplementary table of map unit descriptions compiled and edited by McNab, W. Henry, and Bailey, 

 Robert G. Prepared for the U.S. Department of Agriculture, Forest Service. 



Benedict, Warren V. 1981. History of white pine blister rust control — a personal account. Rep. 355. Wash- 

 ington, DC: U.S. Department of Agriculture, Forest Service. 47 p. 



Busing, Richard T.; Liegel, Leon H.; LaBau, V.J. [In press]. Overstory mortality as an indicator of forest 

 health in California. Environmental Monitoring and Assessment. 85 p. 



Dale, John. 1996. California forest health report (in preparation). FPM Rep. San Francisco, CA: U.S. 

 Department of Agriculture, Forest Service. 



Franklin, J.F.; Dryness, C.T. 1988. Natural vegetation of Oregon and Washington. Corvallis, OR: Oregon 

 State University Press. 452 p. 



Hessburg, Paul P.; Mitchell, R.G.; Filip, G.M. 1994. Historical and current roles of insects and pathogens 

 in eastern Oregon and Washington forested landscapes. Gen. Tech. Rep. PNW-GTR-327. Portland, OR: 

 U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 72 p. 



Liebhold, Andrew M.; MacDonald, William L; Bergdahl, Dale; Mastro, Victor C. 1995. Invasion by 

 exotic forest pests: a threat to forest ecosystems. Forest Science Monograph 30. 49 p. 



Liegel, Leon H.; Busing, Richard T.; LaBau, V.J. 1996. Evaluating overstory conditions to assess forest 

 health in California. In: Proceedings of the Society of American Foresters national convention; 1995 Oct. 

 28-Nov. 1; Portland, ME. Bethesda, MD: Journal of American Foresters: 424-425. 



Liegel, Leon H.; Busing, Richard T.; Solano, Samuel. 1996. Forest health monitoring (FHM) activities in 

 the WEST, 1992-1995. In: Proceedings of the California Forest Pest Council, 44th Annual Meeting; 1995 

 Nov. 15-16; Rancho Cordova, CA. Sacramento, CA: Department of Forestry and Fire Protection: xi-xix. 



Mavity, Erika; Stratton, Daniel; Berrang, Paul. 1995. Effects of ozone on several species of plants which 

 are native to the Western United States. Report. Dry Branch, Georgia: U.S. Department of Agriculture, 

 Forest Service, Center for Forest Environmental Studies. 61 p. 



McNab, W. Henry; Avers, Peter E., comps. 1994. Ecological subregions of the United States: section descrip- 

 tions. Admin. Publ. WO-WSA-5. Washington, DC: U.S. Department of Agriculture, Forest Service. 267 p. 



Sprengel, Keith, comp. 1995. Forest insect and disease conditions. Pacific Northwest Region, 1994. R6-FID- 

 TP-06-95. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Region. 64 p. 



Twardus, Dan; Miller-Weeks, Margaret; Gillespie, Andy. 1995. Forest health assessment for the North- 

 eastern Area, 1993. Tech. Rep. NA-TP-01-95. Radnor, PA: U.S. Department of Agriculture, Forest Ser- 

 vice, Northeastern Area. 61 p. 



U.S. Congress, Office of Technology Assessment. 1993. Harmful non-indigenous species in the United 

 States. Admin. Publ. OTA-F-565. Washington, DC. 391 p. 



U.S. Department of Agriculture, Forest Service. 1996. Air resource management: what we have been doing. 

 R6-NR-TP-14-96. Portland, OR. U.S. Department of Agriculture Forest Service, Pacific Northwest Region. 



Wickman, Boyd E. 1992. Forest health in the Blue Mountains: the influence of insects and diseases. Gen. 

 Tech. Rep. PNW-GTR-295. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific North- 

 west Research Station. 15 p. 



References- 



