peabody-coal-company-and-old-republic-insurance-company-v-harold-greer-and , 62 F.3d 801 ( 1995 )
frances-brown-widow-of-thomas-brown-v-rock-creek-mining-company-inc-and , 996 F.2d 812 ( 1993 )
Richardson v. Perales , 91 S. Ct. 1420 ( 1971 )