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  1. 1
    Geology and uranium deposits of the Ralston Buttes District, Jefferson County, Colorado : comprehensive study of the geology of a major district of productive uranium veins on the east flank of the Front Range west of Denver /
    by Sheridan, Douglas M., 1921-
    Published 1967
    “...Geological Survey professional paper ;...”
    Government Document Microform Book
  2. 2
    Stratigraphy of Slick Rock district and vicinity, San Miguel and Dolores Counties, Colorado /
    by Shawe, Daniel R., 1925-
    Published 1968
    “...Geological Survey professional paper ;...”
    Government Document Microform Book
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