The role of organic matter as a source of nitrogen in Douglas-fir forest soils
By: Robert F. Tarrant.
Contributors: Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Series: Research notes -- no. 48.; Research notes (Pacific Northwest Forest and Range Experiment Station (Portland, Or.)) -- no. 48.
Publisher: Pacific Northwest Forest and Range Experiment Station
Published: 1948
Place of publication: Portland, Or
Language: eng
Subjects: Douglas fir -- Soils.; Soils -- Nitrogen content.; Douglas fir.
Notes: Cover title.

"December 31, 1948."

Also issued online.