21. Potentiometric surface of the alluvial aquifer and hydrologic conditions near Caguas, Puerto Rico, March 1988 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: San Juan, Puerto Rico : Department of the Interior, U.S. Geological Survey, 1989 Resource Type: Map Access & Availability: Loading
22. Potentiometric surface of the alluvial aquifer and hydrologic conditions near Gurabo and Juncos, Puerto Rico, March 1988 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: San Juan, Puerto Rico : U.S. Department of the Interior, U.S. Geological Survey, 1990 Resource Type: Map Access & Availability: Loading
23. Potentiometric surface of the Aquia aquifer in southern Maryland during September 1988 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
24. Potentiometric surface of the Aquia aquifer in southern Maryland during the Fall of 1986 Author/Creator: Mack, Frederick K., author Publication/Creation: Towson, Maryland : Department of the Interior, U.S. Geological Survey, 1987 Resource Type: Map Access & Availability: Loading
25. Potentiometric surface of the Aquia aquifer in southern Maryland during the fall of 1987 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Towson, Maryland : Department of the Interior, U.S. Geological Survey, 1989 Resource Type: Map Access & Availability: Loading
26. The Potentiometric surface of the Aquia aquifer in southern Maryland, September 1985 Author/Creator: Mack, Frederick K., author Publication/Creation: Towson, Maryland : Department of the Interior, U.S. Geological Survey, 1987 Resource Type: Map Access & Availability: Loading
27. Potentiometric surface of the Aquia aquifer in southern Maryland, September 1989 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Towson, Maryland : Department of the Interior, U.S. Geological Survey, 1991 Resource Type: Map Access & Availability: Loading
28. Potentiometric surface of the Black Creek aquifer in the central coastal plain of North Carolina, December 1986 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Raleigh, North Carolina : Department of the Interior, U.S. Geological Survey, 1989 Resource Type: Map Access & Availability: Loading
29. Potentiometric surface of the Edwards-Trinity aquifer system and contiguous hydraulically connected units, west-central Texas, winter, 1974-75 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Austin, Texas : Department of the Interior, U.S. Geological Survey, 1990 Resource Type: Map Access & Availability: Loading
30. Potentiometric surface of the Floridan aquifer system in the Northwest Florida Water Management District, May 1985 Author/Creator: Rosenau, Jack C., author Publication/Creation: Tallahassee, Florida : Department of the Interior, U.S. Geological Survey, 1986 Resource Type: Map Access & Availability: Loading