TY - RPRT TI - Reconnaissance of geology and ground water in the lower Grand River valley, South Dakota, with a section on Chemical quality of the ground water AU - Paul C. Tychsen AU - R.C. Vorhis AU - Eugene R. Jochens PY - 1955 DO - 10.3133/wsp1298 UR - https://pubs.usgs.gov/publication/wsp1298 ID - wsp1298 ER -