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  1. By: Hawkins, Lon Adrian,
    Publication info: Baltimore,1913.
    Holding Institution: University of California Libraries (archive.org)
  2. By: Hawkins, Lon Adrian,
    Publication info: Baltimore,1913.
    Holding Institution: The Johns Hopkins University Sheridan Libraries (archive.org)
  3. By: Livingston, Burton Edward, - Hawkins, Lon Adrian, - Pulling, Howard Edward.
    Publication info: Washington, D. C.,Carnegie Institution of Washington,1915.
    Holding Institution: Cornell University Library
  4. By: Livingston, Burton Edward, - Hawkins, Lon Adrian, - Pulling, Howard Edward,
    Publication info: Washington, D.C.Carnegie Institution of Washington1915
    Holding Institution: University of Toronto - Gerstein Science Information Centre