Vance, Stanley C.
American industries
Prentice-Hall, 1955
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Agricultural ecology
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Tivy, Joy
Agricultural ecology
Longman Scientific & Technical, 1992
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Singh, Jasbir
Agricultural geography
Tata McGraw-Hill, 1984
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Johnstone, Sydney J. (Sydney James)
Minerals for the chemical and allied industries
John Wiley & Sons, 1961
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