National Independent Coal Operators' Assn. v. Kleppe , 96 S. Ct. 809 ( 1976 )
Lucas Coal Company v. Interior Board of Mine Operations Appeals , 522 F.2d 581 ( 1975 )
United Mine Workers of America v. Cecil D. Andrus, Secretary of the Interior, Carbon Fuel Co., Intervenor , 581 F.2d 888 ( 1978 )