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: USDA Forest Service research paper PNW -- 216
Publisher: Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station
Published: 1977
Place of publication: Portland, Or
Language: eng
Subjects: Douglas-fir tussock moth
Notes: Cover title

Bibliography: p. 8