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Federal
Coal Refuse Disposal Areas
Department of the Interior —
As described by ASTM D7780-12: This feature class contains polygons that depict the location of coal refuse disposal areas. They include, but are not limited to,... -
Federal
Coal Fields of the Conterminous United States
Department of the Interior —
"Coal Fields of the Conterminous United States" is a digital representation of James Trumbull's "Coal Fields of the United States" (sheet 1, 1960), which is an...