TY - RPRT TI - The difference between the potentiometric surfaces of the Aquia aquifer, September 1982 and September 1999 in southern Maryland AU - Stephen E. Curtin AU - David C. Andreasen AU - Judith C. Wheeler PY - 2001 DO - 10.3133/ofr01205 UR - https://pubs.usgs.gov/publication/ofr01205 ID - ofr01205 ER -