Paper birch seed production in the Tanana Valley, Alaska
By: by John C. Zasada and Robert A. Gregory.
Contributors: Gregory, Robert A.
Series: USDA Forest Service research note PNW -- 177.
Publisher: Pacific Northwest Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture
Published: 1972
Place of publication: Portland, Ore
Language: eng
Subjects: Paper birch -- Seeds -- Alaska -- Tanana River Valley.
Notes: Caption title.

"June 1972."

Includes bibliographical references (p. 7).