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Yam in Africa and the World Trends of Vital Statistics, 1965-84
Tesfaye Gebremeskel
出版Socioeconomic Unit, International Institute of Tropical Agriculture (IITA), 1987
ISBN97813101979789781310195
URLhttp://books.google.com.hk/books?id=64rFtAEACAAJ&hl=&source=gbs_api