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- 57055434 contributor B1377964.
- 57055434 created "1940.".
- 57055434 date "1940".
- 57055434 date "1940.".
- 57055434 dateCopyrighted "1940.".
- 57055434 extent "27 p.".
- 57055434 issued "1940".
- 57055434 issued "1940.".
- 57055434 language "eng".
- 57055434 publisher "Washington, U.S. Dept. of Agriculture, Bureau of Agricultural Economics,".
- 57055434 spatial "Minnesota.".
- 57055434 subject "Farm mechanization Minnesota.".
- 57055434 subject "S751 .B35".
- 57055434 subject "Tractors.".
- 57055434 title "The tractor and its effects on farming in Minnesota, by Ross V. Baumann, Truman R. Nodland and G. A. Pond.".
- 57055434 type "text".