San Juan, Puerto Rico : U.S. Department of the Interior, U.S. Geological Survey, 1990
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Map
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Potentiometric surface of the alluvial aquifer and hydrologic conditions near Gurabo and Juncos, Puerto Rico, March 1988 / by Juan C. Puig and Jose M. Rodriguez
Relief shown by contours and spot heights. "Prepared in cooperation with the Puerto Rico Department of Natural Resources and the Puerto Rico Aqueduct and Sewer Authority." Includes text, 3 graphs, and index map.