TY - RPRT TI - Potentiometric Surface of the Upper Patapsco Aquifer in Southern Maryland, September 1995 AU - Stephen E. Curtin AU - David C. Andreasen AU - Frederick K. Mack PY - 1996 DO - 10.3133/ofr96622 UR - https://pubs.usgs.gov/publication/ofr96622 ID - ofr96622 ER -