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@USGS assessment of U.S. coal resources and reserves: https://t.co/BT76PayPCS https://t.co/KDOr7p7ECa
@USGS assessment of U.S. coal resources and reserves: https://t.co/BT76PayPCS https://t.co/KDOr7p7ECa
U.S. #Coal Resources and Reserves Assessment: https://t.co/MlW03iUlpV https://t.co/BNa8Ol8nqC