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2
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A simulation study of constraints on traditional farming systems in Northern Nigeria / by Eric W. Crawford.
- Michigan state university. Department of agricultural economics,
- 1982.
- East Lansing, MI :
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The impact of agricultural technology in sub-Saharan Africa : a synthesis of symposium findings / by James F. Oehmke and Eric W. Crawford.
- Michigan state university. Department of agricultural economics,
- 1993.
- East Lansing, MI :