Geographic variation in speed of seed germination in central Oregon ponderosa pine (Pinus ponderosa Dougl. ex Laws.)
By: John C. Weber and Frank C. Sorensen.
Contributors: Pacific Northwest Research Station (Portland, Or.)
Series: Research paper PNW -- 444.
Publisher: U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, [1992]
Published: 1992
Place of publication: Portland, Or
Language: eng
Number of pages: 12
Subjects: Ponderosa pine -- Oregon; Germination
Notes: Cover title.

"March 1992."

Includes bibliographical references (p. 10-12).