Denver, Colorado : Open-File Services Section, Western Distribution Branch, U.S. Geological Survey
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Map
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Map showing the difference between the potentiometric surfaces of the Magothy aquifer of September 1975 and September 1982 in Southern Maryland / by Frederick K. Mack, Judith C. Wheeler and Stephen E. Curtin
Relief shown by contours and spot heights. Title from title screen (viewed Feb. 29, 2016). Also available online in PDF format from the U.S. Geological Survey Warehouse (http://pubs.er.usgs.gov/). "Prepared in cooperation with Maryland Geological Survey and Maryland Energy Administration."