TY - RPRT TI - Results of a reconnaissance water-quality sampling program of the Ogallala aquifer in Colorado, Kansas, Nebraska, Oklahoma, South Dakota, and Texas AU - Gerald L. Feder AU - Noel C. Krothe PY - 1981 DO - 10.3133/wri8165 UR - https://pubs.usgs.gov/publication/wri8165 ID - wri8165 ER -