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Google圖書搜尋
The Nature, Rate and Effective Limits of Intensification in the Small Holder Farming System of the Kano Close-settled Zone
Michael Mortimore
出版
Federal Agricultural Coordinating Unit
, 1990
URL
http://books.google.com.hk/books?id=AwQ-AAAAYAAJ&hl=&source=gbs_api