Lappala, E. G. Changes in Water Supply in the Upper Republican Natural Resources District, Southwest Nebraska, from 1952-75 (OFR-76-498). July 1976. 17 pp., 8.5" x 11". Description: The Upper Republican Natural Resources District is in southwestern Nebraska and includes Chase, Dundy and Perkins Counties. The area covered in the study includes the district and that part of Keith County south of the South Platte River which is considered the northern hydrologic boundary of the area.