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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Churchill, E. P. (Edward Perry),
    Publication info: Washington, Govt. print. off, 1920
    Holding Institution: Library of Congress
  1. By: Churchill, E. P. (Edward Perry),
    Type: Article
    In: The Biological bulletin
    Volume: 29
    Date: 1915-07-01
    Page Range: 68--86
    Publication Info: Woods Hole, Mass Marine Biological Laboratory