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Western spruce budworm, Choristoneura occidentalis. 1995. Shepherd, R.F.; Cunningham, J.C.; Otvos, I.S.(Chapter 11) Pages 119-121 in J.A. Armstrong and W.G.H. Ives, Editors. Forest Insect Pests in Canada. Natural Resources Canada, Canadian Forest Service, Headquarters, Science and Sustainable Development Directorate, Ottawa. 732 p.

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