TY - RPRT TI - Potentiometric surface of the Aquia aquifer in southern Maryland, September 1989 AU - Frederick K. Mack AU - Stephen E. Curtin AU - David C. Andreasen AU - Judith C. Wheeler PY - 1991 DO - 10.3133/wri914094 UR - https://pubs.usgs.gov/publication/wri914094 ID - wri914094 ER -