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_aCasey, Frank. _919814 |
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_aA course in farming systems research _b: the Cornell experience |
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_aIthaca : _bCornell University ; New York : _bState College of Agriculture and Life Science, _c1982 |
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_aCornell international agriculture mimeograph _v; 93 |
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_aSistemas de cultivo. _9106746 |
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_aBarker, Randolph. _910211 |
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_aCornell international agriculture mimeograph _v; 93 |
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