Historical Water-Quality Data for the High Plains Regional Litke, D. W. 2001. Ground-Water Study Area in Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming, 1930-98 (WRIR-00-4254). 65 pp., size 8.5" x 11". Desciption: The purpose of this report is to describe and assess historical (1930-98) water-quality data for the High Plains study area. A compilation of historical data is described, including sources of data, data-base design, screening procedures and quality assurance of data, and characteristics of the resulting data base (which is also included as a CD).