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Progress of Farm Mechanization, by Martin R. Cooper, Glen T. Barton and Albert P. Brodell

Martin R. CooperGlen T. BartonAlbert P. BrodellEtats-Unis. Department of agriculture

出版	U.S. Government Printing Office, 1947
URL	http://books.google.com.hk/books?id=KFpdtwAACAAJ&hl=&source=gbs_api