Light thinning of Douglas-fir does not stimulate regeneration
By: by Norman P. Worthington and Charles F. Heebner.
Contributors: Heebner, Charles F.; Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Series: U.S. Forest Service research note PNW -- 16.
Publisher: Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture
Published: 1964
Place of publication: Portland, Or
Language: eng
Subjects: Douglas fir -- Thinning -- Washington (State) -- Grays Harbor County.
Notes: Caption title.

"September 1964."

Includes bibliographical references.