Towson, Maryland : U.S. Department of the Interior, U.S. Geological Survey, 1987
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Potentiometric surface of the Magothy aquifer in southern Maryland during the Fall of 1986 / Frederick K. Mack, D.C. Adreasen, S.E. Curtin, and J.C. Wheeler
Relief shown by contours. "Prepared in cooperation with Maryland Geological Survey and Maryland Power Plant Research Program." Also available online in PDF format from the U.S. Geological Survey Warehouse (http:/pubs.er.usgs.gov/).