Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Knapr Andrew K., J. C. W., J. T. Hoffman, V. Kalve, and L. L. Madeline. 1990. Forest insect and disease conditions: Intermountain Region. United States Department of Agriculture, Forest Service, Intermountain Region, Ogden, Utah. 38 p.