Spruce budworms handbook :
spruce budworn parasites in Maine : a reference manual for collection and identification of common species.

APA Citation

United States. Cooperative State Research Service. (1984). Spruce budworms handbook: spruce budworn parasites in Maine : a reference manual for collection and identification of common species. [Washington, D.C.?]: U.S. Dept. of Agriculture, Forest Service, Cooperative State Research Service.

MLA Citation

United States. Cooperative State Research Service. Spruce Budworms Handbook: Spruce Budworn Parasites In Maine : a Reference Manual for Collection And Identification of Common Species. [Washington, D.C.?]: U.S. Dept. of Agriculture, Forest Service, Cooperative State Research Service, 1984.