TY - RPRT TI - Potentiometric Surface of the Aquia Aquifer in Southern Maryland, September 2007 AU - Stephen E. Curtin AU - David C. Andreasen AU - Andrew W. Staley PY - 2009 DO - 10.3133/ofr20091080 UR - https://pubs.usgs.gov/publication/ofr20091080 ID - ofr20091080 ER -