Layton, C. R. 1969. Annual district report: Northwest District, 1968. Pages 45-54 in Annual district reports of the Forest Insect and Disease Survey, Alberta-Northwest Territories-Yukon region, 1968. Canada Department of Fisheries and Forestry, Forestry Service, Forest Research Laboratory, Calgary, Alberta, Information Report A-X-22.
Layton 1969
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