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  1. By: Roberts, Henry S - Johnson, Nancy S
    Type: Article
    In: The Biological bulletin
    Volume: 110
    Date: 1956-06-01
    Page Range: 334--343
    Publication Info: Woods Hole, Mass Marine Biological Laboratory
  2. By: Roberts, Henry S
    Type: Article
    In: The Biological bulletin
    Volume: 124
    Date: 1963-04-01
    Page Range: 193--199
    Publication Info: Woods Hole, Mass Marine Biological Laboratory