TY - RPRT TI - Potentiometric surface of the Mississippian aquifer in parts of Trigg, Lyon, Caldwell, and Christian Counties, Mississippian Plateau region, Kentucky AU - Raymond O. Plebuch PY - 1978 DO - 10.3133/wri7825 UR - https://pubs.usgs.gov/publication/wri7825 ID - wri7825 ER -