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  1. By: Coppens, Yves
    Type: Article
    In: Bulletin du Muséum national d'histoire naturelle
    Volume: 30
    Series: 2
    Issue: 4
    Date: 1958-06
    Page Range: 402--406
    Publication Info: Paris, Imprimerie nationale, 1907-1971
  2. By: Johanson, Donald C - White, T. D. (Timothy D.) - Coppens, Yves
    Type: Article
    In: Kirtlandia
    Volume: 28
    Date: 1978
    Page Range: 1--14
    Publication Info: Cleveland, Ohio, Cleveland Museum of Natural History,