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  1. By: Mohr, Otto Lous, - Wriedt, Christian,
    Publication info: Washington Carnegie Institution of Washington 1919
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  2. By: Mohr, Otto Lous, - Wriedt, Christian,
    Publication info: Washington, Carnegie institution of Washington, 1919
    Holding Institution: Cornell University Library
  3. By: Mohr, Otto L. - Wriedt, Christian,
    Publication info: Washington, Carnegie Institution of Washington, 1919
    Holding Institution: University of California Libraries