Sugden, B. A., and D. A. Ross. 1960b. Ips oregoni (Eich) in ponderosa pine, interior British Columbia . Canada Department of Forestry, Division of Forest Entomology and Pathology, Bi-monthly Progress Report 16:3.
Sugden & Ross 1960
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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