Furniss, M. M., R. L. Livingston, and M. D. MacGregor. 1981. Development of a stand susceptibility classification for Douglas-fir beetle (Dendroctonus pseudotsugae). Pages 115-128 in R. L. Hedden, S. J. Barras, and J. E. Coster, Hazard-rating systems in forest insect pest management. United States Department of Agriculture, Forest Service, Washington D. C, General Technical Report WO-27.