Layton, C. R. 1970. Annual district report: Northwest District, 1969. Pages 30—35 in Annual district reports of the Forest Insect and Disease Survey Alberta-Northwest Territiories-Yukon region, 1969. Canada Department of Fisheries and Forestry, Forestry Service, Forest Research Laboratory, Calgary, Alberta, Information Report A-X-30.
Layton 1970
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