Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Flake, H. W., and C. J. Germain. 1970. Southwestern States (R-3). Pp. 23-25. in: Forest Insect and Disease Conditions in the United States 1969. Landgraf, A. E. (eds.) United States Department of Agriculture, Forest Service. vi+140 pp..