1. Altitude and configuration of the top of the Floridan aquifer, Duval County, Florida Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: [Reston, Va.] : Department of the Interior, United States Geological Survey, 1978 Format: Map Access & Availability: Loading
2. Altitude of the top of the Deadwood Formation in the Black Hills area, South Dakota Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, Colo. : For sale by USGS Branch of Information Services Format: Map Access & Availability: Loading
3. Altitude of the top of the Inyan Kara Group in the Black Hills area, South Dakota Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, Colo. : For sale by USGS Branch of Information Services Format: Map Access & Availability: Loading
4. Altitude of the top of the Madison Limestone in the Black Hills area, South Dakota Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, Colo. : For sale by USGS Branch of Information Services Format: Map Access & Availability: Loading
5. Altitude of the top of the Minnekahta Limestone in the Black Hills area, South Dakota Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, Colo. : For sale by USGS Branch of Information Services Format: Map Access & Availability: Loading
6. Altitude of the top of the Minnelusa Formation in the Black Hills area, South Dakota Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, Colo. : For sale by USGS Branch of Information Services Format: Map Access & Availability: Loading
7. 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 Format: Map Access & Availability: Loading