Lund, D. G. 1969. Forest insect and disease survey: North Prince George District, 1968. Pages 200-201 in J. Grant, D. Beddows, and D. G. Lund. Annual district reports. Forest Insect and Disease Survey: British Columbia, 1968. Part VII, Prince George Survey District. Canada Department of Fisheries and Forestry, Forestry Branch, Forest Research Laboratory, Victoria, British Columbia, Information Report BC-X-33(Part VII):170-209.