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  1. Fossil mammals of Africa No. 18: East African Miocene and Pleistocene chalicotheres
    By: Butler, P M
    Type: Article
    In: Bulletin of The British Museum (Natural History) Geology
    Volume: 10
    Date: 1965
    Page Range: 163--237
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  2. A new interpretation of the mammalian teeth of tribosphenic pattern from the Albian of Texas
    By: Butler, P M
    Type: Article
    In: Breviora
    Volume: 446
    Date: 1978
    Page Range: 1--27
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