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  1. By: Ewer, R F - Singer, R
    Type: Article
    In: Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum
    Volume: 42
    Date: 1956
    Page Range: 335--347
    Publication Info: Cape Town, South African Museum, 1898-2004
  2. By: Cooke, H B S - Ewer, R F
    Type: Article
    In: Bulletin of the Museum of Comparative Zoology at Harvard College
    Volume: 143
    Date: 1972
    Page Range: 149--295
    Publication Info: Cambridge, Mass The Museum 1863-