An aerial survey of spruce and fir volume killed by the spruce budworm in northern Minnesota
Contributors: United States. Forest Service
Series: U.S. Forest Service research note -- WO-2; U.S. Forest Service research note WO -- 2.
Publisher: U.S. Dept. of Agriculture
Published: 1964
Place of publication: Washington, D.C
Language: eng
Subjects: Conifers; Mortality; Aerial photography in forestry