1. Rock-stratigraphic nomenclature, lithology, and subcrop area of the Galena-Platteville bedrock unit in Illinois and Wisconsin Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 1997 Resource Type: Map Access & Availability: Loading
2. Bedrock-surface altitude in the midwestern basins and arches region of Indiana, Ohio, Michigan, and Illinois Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Columbus, Ohio : U.S. Department of the Interior, U.S. Geological Survey, 1993 Resource Type: Map Access & Availability: Loading
3. Altitude of top of bedrock in the vicinity of Wright-Patterson Air Force Base, Ohio Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Columbus, Ohio : U.S. Department of the Interior, U.S. Geological Survey, 1992 Resource Type: Map Access & Availability: Loading
4. Geologic structure and altitude of the top of the Minnelusa Formation and orientation of mapped cave passages in the Madison Limestone, southern Black Hills, South Dakota Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Huron, South Dakota : U.S. Department of the Interior, U.S. Geological Survey, 1991 Resource Type: Map Access & Availability: Loading
5. Geology, structure, and thickness of hydrogeologic units in part of the Columbia Plateau, Oregon Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Portland, Oregon : Department of the Interior, United States Geological Survey, 1990 Resource Type: Map Access & Availability: Loading
6. Geologic structure and altitude of the top of the Minnelusa Formation, northeastern Black Hills, South Dakota Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Huron, South Dakota : Department of the Interior, United States Geological Survey, 1985 Resource Type: Map Access & Availability: Loading
7. Geologic structure and altitude of the top of the Minnelusa Formation, northern Black Hills, South Dakota and Wyoming, and Bear Lodge Mountains, Wyoming Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Denver, Colorado : Open-File Services Section, Western Distribution Branch, U.S. Geological Survey Resource Type: Map Access & Availability: Loading