TY - RPRT TI - Appraisal of the water resources of the Big Sioux aquifer, Brookings, Deuel, and Hamlin counties, South Dakota AU - Neil C. Koch PY - 1980 DO - 10.3133/wri80100 UR - https://pubs.usgs.gov/publication/wri80100 ID - wri80100 ER -