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  1. By: Gerard, Ralph Waldo, - Falk, I. S. (Isidore Sydney),
    Type: Article
    In: The Biological bulletin
    Volume: 60
    Date: 1931-06-01
    Page Range: 213--226
    Publication Info: Woods Hole, Mass Marine Biological Laboratory
  2. By: Gerard, Ralph Waldo,
    Type: Article
    In: The Biological bulletin
    Volume: 60
    Date: 1931-06-01
    Page Range: 227--241
    Publication Info: Woods Hole, Mass Marine Biological Laboratory
  3. By: Gerard, Ralph Waldo,
    Type: Article
    In: The Biological bulletin
    Volume: 60
    Date: 1931-06-01
    Page Range: 245--268
    Publication Info: Woods Hole, Mass Marine Biological Laboratory