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  1. 1
    Department of the Interior. United States Geological Survey. George Otis Smith, Director. Bulletin 572. Results of spirit leveling in Nebraska 1896 to 1913, inclusive.
    Published 1914
    Subjects: “...United States. Department of the Interior....”
    Connect to the full text of this electronic book
    Government Document eBook
  2. 2
    XVI International Geological Congress : Glacial Geology of the Central States.
    Published 1932
    Subjects: “...Geology United States. http://id.loc.gov/authorities/subjects/sh85054080...”
    Electronic resource (PDF)
    Government Document eBook
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