1. Maps of upper Mississippi embayment Paleozoic and Precambrian rocks Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by U.S. Geological Survey Information Services Resource Type: Map Access & Availability: Loading
2. The Marquette Range Supergroup in the Gogebic iron district, Michigan and Wisconsin Author/Creator: Schmidt, Robert Gordon, 1924- Publication/Creation: Washington : U.S. Govt. Print. Off. : For sale by the Supt. of Docs, GPO, 1980 Resource Type: Book Is Part Of: U.S. Geological Survey bulletin, no. 1459-1465. Access & Availability: Loading