Denver Colorado : Open-File Services Section, Western Distribution Branch, U.S. Geological Survey
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Potentiometric surface of the upper limestone aquifer in the Dorado-Vega Alta area, North-central Puerto Rico, February 1983 / by Heriberto Torres-Sierra
Relief shown by contours and spot heights. "Prepared in cooperation with the Puerto Rico Department of Natural Resources and the Puerto Rico Industrial Development Company." Includes index map.