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Phillips, Martin | Prentice Hall | 2000
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Gilcrest, David W. | University of Nevada Press | 2002
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Shah, M. M. | International Bank for Reconstruction and Developm | 2000
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Foundation for Environmental Conservation. | Elsevier Sequoia. | 1974
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Laycock, George | published in cooperation with the National Audubon | 1971
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