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  1. By: Walker, Joanne G
    Type: Article
    In: The Biological bulletin
    Volume: 138
    Date: 1970-04-01
    Page Range: 235--244
    Publication Info: Woods Hole, Mass Marine Biological Laboratory
  2. By: Walker, Joanne G
    Type: Article
    In: The Biological bulletin
    Volume: 140
    Date: 1971-02-01
    Page Range: 156--165
    Publication Info: Woods Hole, Mass Marine Biological Laboratory