map of us coal mines
Interactive map of coal resources in the United States | American The Geography of Coal in the U.S. | National Geographic Society.
CDC Mining Statistics: Coal Operators NIOSH Coal mining in the United States Wikipedia.
Map of U.S. Coal Mining Areas. Thurber was one of the few Mapping Abandoned Coal Mines – SkyTruth.
Coal Areas in the United States Coal Mine Guide | BNSF.