Biological timekeeping
edited by John Brady
Cambridge University Press, 1982
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Freeman, Scott
Biological science
Prentice-Hall, 2002
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Keeton, William T.
Biological science
Penguin Books, 1976
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Keeton, William T.
Biological science
W.W. Norton, 1967
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Clark, Mary E.
Contemporary biology : concepts and implications
W.B. Saunders, 1973
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