TY - RPRT TI - The Difference Between the Potentiometric Surfaces of the Magothy Aquifer in Southern Maryland, September 1975 and September 2007 AU - Stephen E. Curtin AU - David C. Andreasen AU - Andrew W. Staley PY - 2009 DO - 10.3133/ofr20091083 UR - https://pubs.usgs.gov/publication/ofr20091083 ID - ofr20091083 ER -