Classification of soils.
Contributors: Oregon Agricultural College. Extension Service.
Series: Cir -- 138.; Circular (Oregon Agricultural College. Extension Service) -- 138.
Publisher: Oregon Agricultural College, Extension Service
Published: 1922
Place of publication: Corvallis, OR
Language: eng
Subjects: Soils -- Classification.
Genres: Classification.
Notes: Caption title.

"May, 1922."