Maintaining fertility of Grande Ronde Valley soils
By: [by W.L. Powers and D.E. Richards].
Contributors: Richards, D. E. 1892-
Series: Station bulletin / Oregon Agricultural College Experiment Station -- 311.; Station bulletin (Oregon State Agricultural College. Agricultural Experiment Station) -- 311.
Publisher: Agricultural Experiment Station, Oregon State Agricultural College
Published: 1933
Place of publication: Corvallis, Ore
Language: eng
Number of pages: 23
Subjects: Soil fertility -- Oregon.
Notes: Cover title.