Simpson, George Gaylord, author
New American Library, 1953
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Simpson, George Gaylord, author
Yale University Press, 1952
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Volpe, E. Peter (Erminio Peter), author
Universal Books Stall, 1996"
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Ridley, Mark, author
Blackwell Scientific, , 1993"
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Margulis, Lynn, 1938-, author
Basic Books, 1998
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