Cottrell, C. B., J. C. Holms, and D. A. Ross. 1966a. Status of the spruce beetle, Prince George Forest District, 1965. Pages 187-196 in Annual district reports. Forest Insect and Disease Survey, 1965. Canada Department of Forestry, Forest Research Laboratory, Victoria, British Columbia, Internal Report BC-4.
Cottrell et al. 1966
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