True fir spacing and yield trials
Subtitle: 20-year update
By: Robert O. Curtis
Contributors: Pacific Northwest Research Station (Portland, Or.)
Series: Research Paper -- PNW-RP-590; Research paper PNW -- RP-590
Publisher: United States Department of Agriculture, Forest Service, Pacific Northwest Research Station
Published: 2013
Place of publication: Portland, OR
Language: eng
Number of pages: 32
Subjects: Forest thinning; Trees; Spacing; Growth
Notes: Title from title screen (viewed on July 2, 2013).

"May 2013."

Includes bibliographical references (pages 29-32).