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Field, Barry C.. (2001). Natural resource economics : an introduction . New York: McGraw Hill.

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Field, Barry C.. Natural resource economics : an introduction. New York: McGraw Hill, 2001. Text.

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Field, Barry C.. Natural resource economics : an introduction. New York: McGraw Hill, 2001. Text.

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Field, Barry C.. Natural resource economics : an introduction. New York: McGraw Hill, 2001. Print.