seed orchard tree as pollen sampler
Subtitle: a model and example
By: by Frank C. Sorensen.
Contributors: Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Series: Research note -- PNW-175.; USDA Forest Service research note PNW -- 175.
Publisher: Pacific Northwest Forest and Range Experiment Station, USDA Forest Service
Published: 1972
Place of publication: Portland, Or
Language: eng
Number of pages: 11
Subjects: Douglas fir -- Pollen.
Notes: Cover title.

"May 1972."

Includes bibliographical references (p. 10-11).