TY - RPRT TI - Potentiometric surface and water-level difference maps of selected confined aquifers of Southern Maryland and Maryland's Eastern Shore, 1975-2011 AU - Stephen E. Curtin AU - David C. Andreasen AU - Andrew W. Staley PY - 2012 DO - 10.3133/sir20125165 UR - https://pubs.usgs.gov/publication/sir20125165 ID - sir20125165 ER -