The difference between the potentiometric surfaces of the upper Patapsco Aquifer, September 1990 and September 1997 in Southern Maryland [microform] / 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.
The difference between the potentiometric surfaces of the upper Patapsco Aquifer, September 1990 and September 1997 in Southern Maryland [microform] / 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.