TY - RPRT TI - Altitude and configuration of the potentiometric surface in the Triassic sandstones and shales, northern Chester County, Pennsylvania, October 1989 through March 1990 AU - B. Craig McManus PY - 1990 DO - 10.3133/wri904114 UR - https://pubs.usgs.gov/publication/wri904114 ID - wri904114 ER -