Tripp, H. A., and J. K. Robins. 1968a. Annual report of the Forest Insect and Disease Survey: Alberta-Northwest Territories-Yukon region, 1967. Canada Department of Forestry, Forest Research Laboratory, Calgary, Alberta, Information Report.
Tripp & Robins 1968
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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