TY - RPRT TI - Potentiometric Surface of the Upper Patapsco Aquifer in Southern Maryland, September 2001 AU - Stephen E. Curtin AU - David C. Andreasen AU - Judith C. Wheeler PY - 2002 DO - 10.3133/ofr02446 UR - https://pubs.usgs.gov/publication/ofr02446 ID - ofr02446 ER -