1. Potentiometric surface and hydrologic conditions of the upper aquifer in the Manati-Vega Baja area, north central Puerto Rico, March 1995 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Guaynabo, Puerto Rico : U.S. Department of the Interior, U.S. Geological Survey, 1997 Resource Type: Map Access & Availability: Loading