The Tillage Machinery Laboratory of the United States Department of Agriculture
Series: ARS-42-9; ARS 42 -- 9.
Publisher: U.S. Department of Agriculture, Agricultural Research Service
Published: 1957
Place of publication: [Washington, D.C.?]
Language: eng
Number of pages: 20
Subjects: Tillage; Research; National Tillage Machinery Laboratory (U.S.)
Notes: Cover title.

"March 1957."