Spruce beetle
Schmid, J.M., Beckwith, R.C.
Spruce beetle - Washington 1972 - 1-7 p. - Beetle United States Department of Agriculture, Forest Service. Forest Pest Leaflet No. 127 .
Spruce beetle - Washington 1972 - 1-7 p. - Beetle United States Department of Agriculture, Forest Service. Forest Pest Leaflet No. 127 .