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  1. By: Schaeffer, Asa A. (Asa Arthur),
    Publication info: Princeton, Princeton university press; [etc., etc.] 1920.
    Holding Institution: MBLWHOI Library
  2. By: Schaeffer, Asa A. (Asa Arthur),
    Publication info: Princeton : Princeton University Press, 1920.
    Holding Institution: Francis A. Countway Library of Medicine (archive.org)
  1. By: Schaeffer, Asa A. (Asa Arthur),
    Type: Article
    In: The Biological bulletin
    Volume: 32
    Date: 1917-02-01
    Page Range: 45--742
    Publication Info: Woods Hole, Mass. : Marine Biological Laboratory,