Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Johnson, N. E., and L. F. Pettinger. 1961b. Overwintering mortality of Douglas-fir beetles in infested logs, exposed bark and forest litter in western Washington. Weyerhaeuser Company, Forestry Research Center, Forestry Research Note 42. 11 p.