Walters, J. 1955a. A system of indirect control of the Douglasfir beetle, Dendroctonus pseudotsugae Hopk. Canada Department of Agriculture, Science Service, Forest Biology Division, Forest Biology Laboratory, Vernon, British Columbia. 166 p.
Walters 1955
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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