TY - RPRT TI - Difference between the potentiometric surfaces of the Aquia aquifer in spring of 1979 and fall of 1986 in southern Maryland AU - F. K. Mack AU - D. C. Andreasen AU - S. E. Curtin AU - J. C. Wheeler PY - 1987 DO - 10.3133/wri874215 UR - https://pubs.usgs.gov/publication/wri874215 ID - wri874215 ER -