@book{ BA51188958,
 author = "Leakey, Richard Erskine Frere and Slikkerveer, L. J. (Leendert Jan)",
 title = "Origins and development of agriculture in East Africa: the ethnosystems approach to the study of early food production in Kenya",
 publisher = "",
 year = "1991",
 series = "Studies in technology and social change",
 number = "No.19",
 URL = "https://ci.nii.ac.jp/ncid/BA51188958"
}
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