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  1. By: Seifriz, William
    Type: Article
    In: The Biological bulletin
    Volume: 34
    Date: 1918-05-01
    Page Range: 307--324
    Publication Info: Woods Hole, Mass Marine Biological Laboratory
  2. By: Seifriz, William
    Type: Article
    In: Botanical gazette
    Volume: 70
    Issue: 5
    Date: 1920
    Page Range: 360--386
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991