Influence of date of cone collection on Douglas-fir seed processing and germination :
a case history /
Donald L. Olson, Roy R. Silen.

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Main Author: Olson, Donald F.
Related Names: Silen, Roy R.
United States. Forest Service
Language(s): English
Published: Portland, Or. : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, 1975.
Subjects: Germination.
Douglas fir.
Note: Cover title.
Physical Description: 10 p. : ill. ; 26 cm.
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