Influence of date of cone collection on Douglas-fir seed processing and germination
Subtitle: a case history
By: Donald L. Olson, Roy R. Silen
Contributors: Silen, Roy R.; United States. Forest Service.
Series: USDA Forest Service research paper PNW -- 190
Publisher: U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station
Published: 1975
Place of publication: Portland, Or
Language: eng
Number of pages: 10
Subjects: Douglas fir.; Germination.
Notes: Cover title

Includes bibliographical references