Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
James, R. L., and J. R. Linnane. 1980. Rocky Mountain Region (R-.2). Pages 12-19 in P. W. Orr and H. D. Brown, Forest insect and disease conditions in the United States, 1978. United States Department of Agriculture, Forest Service. vi + 83 p.