Denver, Colo. : Branch of Information Services [distributor].
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Map
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The difference between the potentiometric surfaces of the lower Patapsco Aquifer, September 1990 and September 1997 in Southern Maryland / by Stephen E. Curtin, David C. Andreasen, and Frederick K. Mack ; U.S. Department of the Interior, U.S. Geological Survey ; prepared in cooperation with the Maryland Geological Survey and Resource Assessment Service, Maryland Department of Natural Resources