Tivy, Joy
Agricultural ecology
Longman Scientific & Technical, 1992
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Singh, Jasbir
Agricultural geography
Tata McGraw-Hill, 1984
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Malott, Deane W.
The Agricultural industries
McGraw-Hill, 1939
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Agricultural ecology
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System analysis in agricultural management
edited by J.B. Dent and J.R. Anderson
John Wiley & Sons, 1971
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