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  1. By: Poulsen, Erik M - Lesse, H De
    Type: Article
    In: Bulletin du Muséum national d'histoire naturelle
    Volume: 23
    Series: 2
    Issue: 1
    Date: 1951-01
    Page Range: 99--114
    Publication Info: Paris, Imprimerie nationale, 1907-1971
  2. By: Poulsen, Erik M - Lesse, H De
    Type: Article
    In: Bulletin du Muséum national d'histoire naturelle
    Volume: 23
    Series: 2
    Issue: 2
    Date: 1951-03
    Page Range: 190--195
    Publication Info: Paris, Imprimerie nationale, 1907-1971