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Please read BHL's Acknowledgment of Harmful Content
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  1. By: United States. Coast Guard.
    Edition: Rev. ed., 1949.
    Publication info: Washington, U.S. Govt. Print. Off, 1949
    Holding Institution: MBLWHOI Library
    Subjects: Loran  Radar  
  2. By: Thomas, P. D. (Paul Denis),
    Publication info: Washington, U.S. Naval Oceanographic Office, 1965
    Holding Institution: MBLWHOI Library
    Subjects: Geodesy  Loran  Ready-reckoners