Stratification period and germination of Douglas-fir seed from Oregon seed orchards
Subtitle: two case studies
By: Frank C. Sorensen.
Contributors: Pacific Northwest Research Station (Portland, Or.)
Series: Research note PNW -- 499.
Publisher: U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest Research Station
Published: 1991
Place of publication: Portland, Or
Language: eng
Number of pages: 23
Subjects: Douglas fir -- Growth.; Douglas fir -- Seeds.
Notes: Caption title.

"January 1991."