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17 reports of exploration of coal, lignite to be handed over to coal ministry
Prehistoric mammoth tusk, bones discovered at North Dakota mine - InForum
Lignite Coal U.S. Geological Survey
Lignite Coal – Center Coal Co. North Dakota
Monday meeting will discuss lignite mining potential in South Arkansas, Business
Bituminous Coal U.S. Geological Survey
Energy Resources - Coal Resources Alaska Division of Geological & Geophysical Surveys
Coal - A Fossil Fuel
Coal creation mechanism uncovered
Coal - World Distribution, Fossil Fuel, Energy
Lignite (Brown Coal) - Geology Superstore