A 4-year record of Sitka spruce and western hemlock seed fall
By: [by Robert H. Ruth and Carl M. Berntsen].
Contributors: Berntsen, Carl M.; Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Series: Research paper -- no. 12.; Research paper (Pacific Northwest Forest and Range Experiment Station (Portland, Or.)) -- no. 12.
Publisher: U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station
Published: 1955
Place of publication: [Portland, Or
Language: eng
Number of pages: 12
Subjects: Sitka spruce -- Seeds -- Oregon -- Cascade Head Experimental Forest.; Western hemlock -- Seeds -- Oregon -- Cascade Head Experimental Forest.
Other titles: 4-year record of Sitka spruce and western hemlock seed fall on the Cascade Head Experimental Forest.; Four-year record of Sitka spruce and western hemlock seed fall.
Notes: "March 1955."

Cover title.

Also issued online.