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. Title from title screen (viewed Feb. 4, 2016). "Prepared in cooperation with the Puerto Rico Department of Natural Resources and the Puerto Rico Industrial Development Company." Also available online in PDF format from the U.S. Geological Survey Warehouse (http://pubs.er.usgs.gov/). Includes index map.