Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Ives, W. G. H., N. R. Brandt, and J. J. Lawrence. 1969. Manitoba-Saskatchewan Region. Pages 79-97. Canada Department of Fisheries and Forestry, Canadian Forestry Service, Forest Insect and Disease Survey, Annual Report 1968. 141 p.