A laboratory study of soil reactions on disks
By: E.D. Gordon
Contributors: United States. Bureau of Agricultural Chemistry and Engineering
Series: [ACE -- 15]
Publisher: Bureau of Agricultural Chemistry & Engineering
Published: 1939
Place of publication: [Washington, D.C.?]
Language: eng
Number of pages: 29
Subjects: Cultivators
Notes: Caption title

"To be presented before American Society of Agricultural Engineers, December 5, 1939."

Includes bibliographical references