"High Plains Aquifer." . . . . . . . . "CD is WRIR 00-4254, Appendix C., High Plains retrospective data base and includes the data base used for the report. The data are provided in MS Access format and in ASCII flat file format."@en . . . . . . . . "Historical water-quality data for the High Plains Regional Ground-Water Study Area in Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming, 1930-98"@en . . . . . .