Mason, G. N., R. R. Hicks, C. M. Bryant, M. L. Mathews, D. L. Kulhavy, and J. E. Howard. 1981. Rating southern pine beetle hazard by aerial photography. Pages 109-114 in R. L. Hedden, S. J. Barras, and J. E. Coster (tech. coords.), Hazard-rating systems in forest insect pest management: symposium proceedings. United States Department of Agriculture, Forest Service, General Technical Report WO-27. 169 p.