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  1. 1
    Geologic map of the Olney quadrangle, Caldwell and Hopkins Counties, Kentucky /
    by Trace, Robert Denny, 1917-
    Published 1968
    Government Document Map
  2. 2
    Geologic map of the Dawson Springs SE quadrangle, Christian and Hopkins counties, Kentucky /
    by Trace, Robert Denny, 1917-
    Published 1977
    Government Document Map
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