The large aspen tortrix
By: Roy C. Beckwith
Contributors: United States. Forest Service
Series: Forest pest leaflet -- 139; Forest insect & disease leaflet -- 139.
Publisher: U.S. Dept. of Agriculture, Forest Service
Published: 1973
Place of publication: [Washington, D.C.]
Language: eng
Subjects: Aspen; Diseases and pests; Tortrix; Diseases
Notes: Caption title.

"February 1973."

Includes bibliographical references (p. 5).