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2
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Food problems and prospects : pastoralism in the African scene : [paper] presented / by Dawn Chatty and Eduardo Cruz de Carvalho.
- 86
- African studies association (ASA)],
- 1974.
- [Waltham, MA :
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African receptivity to change : technology, the slave trade, and economic growth : [paper] presented / by Thomas R. DeGregori.
- 862
- African studies association (ASA)],
- 1974.
- [Waltham, MA :