Ecology of the great grey owl
By: Evelyn L. Bull and Mark G. Henjum.
Contributors: Henjum, Mark G.; Pacific Northwest Research Station (Portland, Or.)
Series: General technical report PNW -- 625.
Publisher: U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station
Published: 1990
Place of publication: Portland, Or
Language: eng
Number of pages: 39
Subjects: Great gray owl
Notes: Cover title.

"September 1990."

Includes bibliographical references (p. 37-38).