San Juan, Puerto Rico : Department of the Interior, U.S. Geological Survey, 1989
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Full Title:
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
Title from title screen (viewed Feb. 4, 2016). Also available online in PDF format from the U.S. Geological Survey Warehouse (http://pubs.er.usgs.gov/). "Contour interval 10 meters." Includes text, graph, and index map pages. Relief shown by contours and spot heights. "Prepared in cooperation with the Puerto Rico Water and Sewer Authority - Puerto Rico Department of Natural Resources."