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_aAlston, Julian M. _94652 |
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_aScience under scarcity : _bprinciples and practice for agricultural research evaluation and priority setting _c/by Julian M. Alston, George W. Norton and Philip G. Pardey |
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_aIthaca, N.Y. : _bCornell University Press, _c1995. |
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_aAgricultura _xInvestigación. _91577 |
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_aNorton, George W. _981834 |
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_aPardey, Philip G. _985489 |
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_aFood systems and agrarian change _942203 |
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