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  1. 1
    Photographs of historical mining operations in Colorado and Utah from the U.S. Geological Survey Library /
    Published 1994
    Government Document Book
  2. 2
    Stratigraphic nomenclature databases for the United States, its possessions and territories /
    Published 1994
    Government Document Book
  3. 3
    Photoglossary of marine and continental ichnofossils /
    by Hasiotis, Stephen T.
    Published 1994
    Government Document Book
  4. 4
    National geochronological and natural radioelement data bases /
    Published 1995
    Government Document Book
  5. 5
    Stratigraphic nomenclature databases for the United States, its possessions and territories /
    Published 1996
    Government Document Map
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