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  1. By: Browne, Marie J - Pitts, Marjorie W - Pitts, Robert F
    Type: Article
    In: The Biological bulletin
    Volume: 99
    Date: 1950-10-01
    Page Range: 152--156
    Publication Info: Woods Hole, Mass Marine Biological Laboratory
  2. By: Pitts, Robert F
    Type: Article
    In: The Biological bulletin
    Volume: 64
    Date: 1933-06-01
    Page Range: 418--423
    Publication Info: Woods Hole, Mass Marine Biological Laboratory