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ON-007-08 Historic Mining Districts of Colorado (detail) ON-007-08D Historic Metal Mining Districts of Colorado (Data) – v20201112
IS-82 Colorado Mineral and Energy Industry Activities 2018-2019 IS-82 Colorado Mineral and Energy Industry Activities 2018-2019
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IS-79 Colorado Mineral and Energy Industry Activities 2015-2016 IS-79 Colorado Mineral and Energy Industry Activities 2015-2016
IS-78 Colorado Mineral and Energy Industry Activities 2014-2015 IS-78 Colorado Mineral and Energy Industry Activities 2014-2015