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635.043 CLE | PD.043
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631.521 KEL
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633.009 LIT
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635.048 HEM
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631.521 AGR
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631.068 JOH | PG.009
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631.5 AGR | PG.001
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631.64 WAM
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The natural, economic, and socio-institutional conditions of agricultural production vary widely from place to place and over periods of time. In the process of adapting cropping patterns and farming practices to the conditions of each location and the aims of the farmers, more or less distinct...