 | Stephen Walker - 1983 - 437 pages
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 | Gillian Beer - 1983 - 303 pages
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 | 1984 - 518 pages
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 | Charles Darwin - 1955 - 616 pages
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 | 1985 - 646 pages
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 | Jeffrey Weeks - 1985 - 342 pages
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| 1989 - 508 pages
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... one general law, leading to the advancement of all organic beings, namely, multiply, vary, let the strongest live and the weakest die. 
