TY - RPRT TI - Altitude and configuration of the potentiometric surface in the upper White Clay Creek and lower West Branch Brandywine Creek Basins including portions of Penn, London Grove, New Garden, Londonderry, West Marlborough, Highland, and East Fallowfield Townships and West Grove, Avondale, Modena, and South Coatesville boroughs, Chester County, Pennsylvania, May through July 2006 AU - Lindsay B. Hale PY - 2007 DO - 10.3133/sim2995 UR - https://pubs.usgs.gov/publication/sim2995 ID - sim2995 ER -