Correlation between dates of floral and vegetative bud flush in Douglas-fir
By: by Frank C. Sorensen and Robert K. Campbell.
Contributors: Campbell, Robert Kenneth, 1927-; Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Series: Research note -- PNW-143.; USDA Forest Service research note PNW -- 143.
Publisher: Pacific Northwest Forest and Range Experiment Station, USDA Forest Service
Published: 1971
Place of publication: Portland, Or
Language: eng
Subjects: Douglas fir -- Oregon -- Willamette River Valley -- Flowering time.; Douglas fir -- Oregon -- Willamette River Valley -- Growth.
Notes: Caption title.

"February 1971."

Includes bibliographical references (p. 4).