Vanderwal, H. 1969. Forest insect and disease survey, Central Nelson, 1968. Pages 144-155 in R. J. Andrews, H. Vanderwal, and N. G. Bauman, Annual district reports, Forest Insect and Disease Survey, British Columbia, 1968, Part VI, Nelson Survey District. Canada Department of Fisheries and Forestry, Forestry Branch, Forest Research Laboratory, Victoria, British Columbia, Information Report BC-X-33(VI):130-169.