Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Johnson, N. E., and L. F. Pettinger. 1961a. Douglas-fir beetle (Dendroctonus pseudotsugae) attacks in living trees influenced by the presence of fresh windthrow. Weyerhaeuser Company, Forestry Research Center, Forestry Research Note 37. 8 p.