Cooling a Douglas-fir seed orchard to avoid pollen contamination
By: by Roy R. Silen and Gene Keane.
Contributors: Keane, Gene.
Series: U.S.D.A. Forest Service research note PNW -- 101.; USDA Forest Service research note PNW -- 101.
Publisher: Pacific Northwest Forest and Range Experiment Station, U.S.D.A. Forest Service
Published: 1969
Place of publication: Portland, Ore
Language: eng
Number of pages: 10
Subjects: Douglas fir -- Seeds.; Douglas fir -- Pollen.; Douglas fir -- Pollen management.
Notes: Caption title.

"March 1969."

Includes bibliographical references.