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From the site: "Commodities covered by the Minerals Information Team (MIT) of the U.S. Geological Survey. Included are crushed stone operations considered active in 1998 with...
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View within SubmissionGathering Resources...From the site: "[L]inks to the digital coal resource shapefiles available from the ISGS Coal Section. The listed shapefiles are the same ones that were used to construct the...-
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View within SubmissionGathering Resources... -