An atlas of spruce budworm defoliation in eastern North America, 1938-80 / by Yvan Hardy, Michel Mainville, and Daniel M. Schmitt.

by Hardy, Yvan.
[Washington, D.C.] : U.S. Dept. of Agriculture, Forest Service, Cooperative State Research Service, [1986].

Series: Miscellaneous publication (United States. Department of Agriculture) ; no. 1449.