Sampling low density populations of the Douglas-fir tussock moth by frequency of occurrence in the lower tree crown
By: Richard R. Mason.
Contributors: Pacific Northwest Forest and Range Experiment Station (Portland, Or.); United States. Forest Service.
Series: Research paper PNW -- 216.; Research paper PNW -- 216.
Publisher: Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture, Forest Service
Published: 1977
Place of publication: Portland, Or
Language: eng
Subjects: Douglas-fir tussock moth
Notes: Cover title.

Bibliography: p. 8.