Developments in American farming
著者
書誌事項
Developments in American farming
（World food supply）
Arno Press, 1976
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注記
Reprint of the 1947 ed. of Progress of farm mechanization, by M. R. Cooper, G. T. Barton, and A. P. Brodell, published by U.S. Govt. Print. Off., Washington, as Miscellaneous publication no. 630 of the U.S. Dept. of Agriculture; and of the 1949 ed. of Changes in American farming, by S. E. Johnson, published by U.S. Govt. Print. Off., Washington, as Miscellaneous publication no. 707 of the U.S. Dept. of Agriculture