Caltrell, R. M. 1969. Annual district report: Grande Prairie-Peace River District, 1968. Pages 55-63 in Annual reports of the Forest Insect and Disease Survey: Alberta-Northwest Territories-Yukon Region, 1968. Canada Department of Fisheries and Forestry, Canadian Forest Service, Forest Research Laboratory (Calgary, Alberta), Information Report A-X-22.
Caltrell 1969
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