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Coal Fields of the Conterminous United States - May 3, 1996
PDF and shapefile maps and data depicting the coal fields of the conterminous United States. Includes coal production data, coal type rankings, coal ages, and other information.-
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National Geologic Map Database
A distributed archive of standardized geoscience spatial information and data for the nation. Developed by the USGS and State Geological Surveys.-
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