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  1. By: Blok, A.
    Type: Article
    In: Journal of Conchology
    Volume: 23
    Issue: 4
    Date: 1950-07
    Page Range: 98--98
    Publication Info: London D. Bogue
  2. By: Blok, A. - Pain, Thomas
    Type: Article
    In: Journal of Conchology
    Volume: 22
    Issue: 12
    Date: 1948-05
    Page Range: 299--302
    Publication Info: London D. Bogue