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Google圖書搜尋
Annual Costs, Returns and Seasonal Labor Requirements for Selected Farm and Nonfarm Enterprises in Rural Sierra Leone
Dunstan S. C. Spencer
Derek Byerlee
Steven Charles Franzel
出版
Department of Agricultural Economics
, 1979
URL
http://books.google.com.hk/books?id=PMxjvgEACAAJ&hl=&source=gbs_api
