Safranyik, L. 1976a. Climatic barriers and influences on integrated control of Dendroctonus ponderosae Hopkins (Cqleoptera: Scolytidae) in western Canada. Pages 429-438 in R. Z. Callahan and A. Bakke. XVI IUFRO World Congress, Proceedings, 20 June-2 July 1976, Oslo, Norway, Division II.