41. Difference between the potentiometric surface of the Aquia aquifer in Spring of 1979 and Fall of 1986 in southern Maryland Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Towson, Maryland : Department of the Interior, U.S. Geological Survey, 1987 Resource Type: Map Access & Availability: Loading
42. The difference between the potentiometric surfaces of the Aquia aquifer of September 1986 and September 1988 in southern Maryland Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Towson, Maryland : Department of the Interior, U.S. Geological Survey, 1990 Resource Type: Map Access & Availability: Loading
43. The difference between the potentiometric surfaces of the Aquia Aquifer, September 1982 and September 1997 in Southern Maryland Author/Creator: Curtin, Stephen E. Publication/Creation: Denver, Colo. : Branch of Information Services [distributor]. Resource Type: Map Access & Availability: Loading
44. The difference between the potentiometric surfaces of the lower Patapsco Aquifer, September 1990 and September 1997 in Southern Maryland Author/Creator: Curtin, Stephen E. Publication/Creation: Denver, Colo. : Branch of Information Services [distributor]. Resource Type: Map Access & Availability: Loading
45. The difference between the potentiometric surfaces of the Magothy Aquifer, September 1975 and September 1997 in Southern Maryland Author/Creator: Curtin, Stephen E. Publication/Creation: Denver, Colo. : Branch of Information Services [distributor]. Resource Type: Map Access & Availability: Loading
46. The difference between the potentiometric surfaces of the upper Patapsco Aquifer, September 1990 and September 1997 in Southern Maryland Author/Creator: Curtin, Stephen E. Publication/Creation: Denver, Colo. : Branch of Information Services [distributor]. Resource Type: Map Access & Availability: Loading
47. Digital compilation of "Preliminary map of landslide deposits in Santa Cruz County, California, by Cooper-Clark and Associates, 1975", a digital database Author/Creator: Roberts, Sebastian Publication/Creation: [Reston, Va.?] : U.S. Dept. of the Interior, U.S. Geological Survey, 1998 Resource Type: Map Access & Availability: Loading
48. Digital geologic map database of the Payette National Forest and vicinity, Idaho Publication/Creation: [Reston, Va.?] : The Survey, 1999 Resource Type: Map Access & Availability: Loading
49. Digital geologic map of Yellowstone National Park, Idaho, Montana, and Wyoming and vicinity Author/Creator: Geological Survey (U.S.) Publication/Creation: [Reston, Va.?] : The Survey, [1999] Resource Type: Map Edition: Online version 1.0, 5 April 1999. Access & Availability: Loading
50. Digital model analysis of the principal artesian aquifer, Glynn County, Georgia Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: [Reston, Va.?] : Department of the Interior, United States Geological Survey, 1975 Resource Type: Map Access & Availability: Loading