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  1. By: Richards, W J
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 79
    Date: 1966
    Page Range: 171--174
    Publication Info: Washington, Biological Society of Washington,
  2. By: Richards, W J - Yato, T. - Last, P R
    Type: Article
    In: Smithiana Bulletin
    Volume: 2
    Date: 2003
    Page Range: 1--18
    Publication Info: Grahamstown, South Africa, South African Institute for Aquatic Biodiversity, c2002-