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"OpenStreetMap contributors"
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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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View within SubmissionGathering Resources...From the site: "A cells polygon feature class was created by the U. S. Geological Survey (USGS) to illustrate the degree of exploration, type of production, and distribution of...-
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View within SubmissionGathering Resources... -