@book{ BA43794781,
 author = "Blench, R. and Overseas Development Institute (London, England)",
 title = "Animal tracction in West Africa: categories, distribution and constraints : a Nigerian case study",
 publisher = "Overseas Development Institute",
 year = "1997",
 series = "ODI working paper",
 number = "106",
 URL = "https://ci.nii.ac.jp/ncid/BA43794781"
}
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