Lieber, Rochelle, 1954-, author
Cambridge University Press, 2016
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Wojciechowski, Jerzy A., author
Council for research in values and philosophy, [Date of publication not identified]
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Odum, Eugene Pleasants, author
Saunders College, 1983
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Pianka, Eric R., author
Harper & Row, 1988
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Dash, Madhab C., author
Tata McGraw-Hill , 2003
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