1. High-alumina hydrothermal systems in volcanic rocks and their significance to mineral prospecting in the Carolina slate belt Author/Creator: Schmidt, Robert Gordon, 1924- author Publication/Creation: [Reston, Va.] : Department of the Interior, U.S. Geological Survey, 1985 Resource Type: Book Access & Availability: Loading
2. The Marquette Range Supergroup in the Gogebic iron district, Michigan and Wisconsin Author/Creator: Schmidt, Robert Gordon, 1924- author Publication/Creation: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1980 Resource Type: Book Access & Availability: Loading
3. The potential for porphyry copper-molybdenum deposits in the Eastern United States : a descriptive resumé of deposits of the porphyry type and an evaluation of potential areas for discovery of new deposits Author/Creator: Schmidt, Robert Gordon, 1924- author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1978 Resource Type: Book Access & Availability: Loading
4. Geology of the Precambrian W (lower Precambrian) rocks in western Gogebic County, Michigan Author/Creator: Schmidt, Robert Gordon, 1924- author Publication/Creation: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1976 Resource Type: Book Access & Availability: Loading
5. Geology and ore deposits of the Cuyuna North Range, Minnesota Author/Creator: Schmidt, Robert Gordon, 1924- author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 19063 Resource Type: Book Access & Availability: Loading