TY - RPRT TI - Conceptualization and analysis of ground-water flow system in the Coastal Plain of Virginia and adjacent parts of Maryland and North Carolina AU - John F. Harsh AU - Randell J. Laczniak PY - 1990 DO - 10.3133/pp1404f UR - https://pubs.usgs.gov/publication/pp1404F ID - pp1404F ER -