The encyclopedia of prehistoric life/ edited by Rodney Steel, Anthony P. Harvey
McGraw-HIll, 1979
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Botha, Rudolf P
Language evolution : the Windows Approach
Cambridge University Press, 2016
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Life before man / by the editors of Time-Life Book
Time-Life Books, 1972
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Life before man / by the editors of Time-Life Books.
Time-Life Books, 1972
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Volpe, E. Peter (Erminio Peter)
Understanding evolution
Universal Books Stall, 1996"
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