Western spruce budworm
Carolin, V.M., Honing, F.W.
Western spruce budworm - Washintgon 1972 - 1-8 p. - United States Department of Agriculture, Forest Service. Forest Pest Leaflet No. 53 .
Western spruce budworm - Washintgon 1972 - 1-8 p. - United States Department of Agriculture, Forest Service. Forest Pest Leaflet No. 53 .