San Juan, Puerto Rico : Department of the Interior, U.S. Geological Survey, 1989
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Map
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Potentiometric surface of the alluvial aquifer and hydrologic conditions near Caguas, Puerto Rico, March 1988 / by Juan Carlos Puig, Felix Rodriguez-del-Rio, and Jose M. Rodriguez
Relief shown by contours and spot heights. "Prepared in cooperation with the Puerto Rico Water and Sewer Authority - Puerto Rico Department of Natural Resources." Includes text, graph, and index map pages.