Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Tripp, H. A., J. R. Robins, and R. A. Blauel. 1970. Alberta-Northwest Territories-Yukon Region. Pages 84-96. Canada Department of Fisheries and Forestry, Canadian Forestry Service, Forest Insect and Disease Survey, Annual Report 1969. 125 p.