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Field, Barry C., Field, Martha K.. (2013). Environmental Economics An Introduction Sixth Edition . New York: McGraw-Hill.

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Field, Barry C., Field, Martha K.. Environmental Economics An Introduction Sixth Edition. New York: McGraw-Hill, 2013. Text.

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Field, Barry C., Field, Martha K.. Environmental Economics An Introduction Sixth Edition. New York: McGraw-Hill, 2013. Text.

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Field, Barry C., Field, Martha K.. Environmental Economics An Introduction Sixth Edition. New York: McGraw-Hill, 2013. Print.