A record of ponderosa pine seed flight
By: by James W. Barrett.
Contributors: Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Series: U.S. Forest Service research note PNW -- 38.
Publisher: Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture
Published: 1966
Place of publication: Portland, Or
Language: eng
Subjects: Ponderosa pine -- Seeds -- Dispersal -- Oregon -- Pringle Falls Experimental Forest.
Notes: Caption title.

"April 1966."

Includes bibliographical references (p. 4-5).