TY - RPRT TI - Potentiometric surface of the lower Patapsco Aquifer in southern Maryland, September 1998 AU - Stephen E. Curtin AU - D. C. Andreasen AU - Frederick K. Mack PY - 2000 DO - 10.3133/ofr0086 UR - https://pubs.usgs.gov/publication/ofr0086 ID - ofr0086 ER -