1. Dillman, R.D., Shen, S.S., Eav, B.B. and White, W.B. (1981) —Operational Test of Panoramic Aerial Photography for Estimating Annual Mortality of Ponderosa Pine Caused by Mountain Pine Beetle, USDA Forest Service and Lockhead Engineering and Management Services Co, Inc, LEMSCO-16337 (Houston), 28 pp.
2. Fiddick, R.L. and Van Sickle, G.V. (1980) —Forest Insect and Disease Conditions, British Columbia, 1980, Pacific Forest Research Centre, Victoria, BC, Report BC-X-220, 23 pp.