41. 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
42. Geology and hydrology of the deep bedrock aquifers in eastern Colorado Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: [Reston, Va.] : Department of the Interior, U.S. Geological Survey, 1987 Resource Type: Map Access & Availability: Loading
43. Ground-water availability from the unconsolidated deposits of the St. Lawrence River Basin, New York Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Albany, New York : United States Department of the Interior, Geological Survey, 1987 Resource Type: Map Access & Availability: Loading
44. Ground-water levels in the lower Paleozoic and Precambrian crystalline rocks, southeastern Chester County, Pennsylvania, July and August 1986 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: [Reston, Va.] : United States Department of the Interior, Geological Survey, 1987 Resource Type: Map Access & Availability: Loading
45. Generalized potentiometric surface of the Catahoula aquifer in central Louisiana, 1980 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: [Baton Rouge, La.] : Department of the Interior, U.S. Geological Survey, 1986 Resource Type: Map Access & Availability: Loading
46. Ground-water availability in the Black River Basin, New York Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Ithaca, New York : United States Department of the Interior, Geological Survey, 1986 Resource Type: Map Access & Availability: Loading
47. Ground-water availability in the eastern part of the Lake Ontario Basin, New York Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Ithaca, New York : United States Department of the Interior, Geological Survey, 1986 Resource Type: Map Access & Availability: Loading
48. Ground-water levels in three basalt hydrologic units underlying the Columbia Plateau, Washington and Oregon, spring 1984 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Reston, Virginia : Department of the Interior, United Stattes Geological Survey, 1986 Resource Type: Map Access & Availability: Loading
49. Geohydrology of the Irondequoit Creek Basin near Rochester, New York 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
50. Ground-water levels in the Cockeysville marble of southern Chester County, Pennsylvania, 1983-84 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Reston, Virginia : United States Department of the Interior, Geological Survey, 1985 Resource Type: Map Access & Availability: Loading