Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Molnar, A. C., J. W. E. Harris, D. A. Ross, and J. A. Baranyay. 1970. British Columbia Region . Canada Department of Fisheries and Forestry, Canadian Forestry Service, Forest Insect and Disease Survey, Annual Report 1969:97-109.