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  1. By: Schaeffer, Asa A. (Asa Arthur),
    Publication info: Princeton :Princeton University Press,1920.
    Holding Institution: Francis A. Countway Library of Medicine (archive.org)
  2. By: Schaeffer, Asa A. (Asa Arthur),
    Publication info: Princeton,Princeton university press; [etc., etc.]1920.
    Holding Institution: MBLWHOI Library
  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,