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Poultry-ration Costs and Poultry-feed Price Ratios, 1924-45 ...
United States. Bureau of Agricultural EconomicsRonald Earle Johnson
出版United States. Bureau of Agricultural Economics, 1946
URLhttp://books.google.com.hk/books?id=j6BQGSClH24C&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN