Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Walters, J. W., and G. Lessard. 1978. Southwestern Region (R-3). Pages 9-13 in H. D. Brown and P. W. Orr, Forest insect and disease conditions in the United States, 1976. United States Department of Agriculture, Forest Service. vi + 40 p.