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Google圖書搜尋
Farm Labor Requirements in the United States 1939 and 1944
Reuben William Hecht
出版
U.S. Department of Agriculture, Bureau of Agricultural Economics
, 1947
URL
http://books.google.com.hk/books?id=ho-EfMi7eIEC&hl=&source=gbs_api
EBook
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