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    Maps showing the extent of mining, locations of mine shafts, adits, air shafts, and bedrock faults, and thickness of overburden above abandoned coal mines in the Boulder-Weld Coal Field, Boulder, Weld, and Adams counties, Colorado /
    by Roberts, Stephen B.
    Published 2001
    Subjects: “...Abandoned coal mines Colorado Boulder County Maps....”
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    Government Document Map
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