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Ground-water resources of the lower Niobrara River and Ponca Creek basins, Nebraska and South Dakota
Thomas G. Newport, Robert A. Krieger
1959, Water Supply Paper 1460-G
This report describes the area in north-central Nebraska and south-central South Dakota drained by Ponca Creek and by the Niobrara River below Valentine, Nebr. The Niobrara River and Ponca Creek are neighboring eastward flowing tributaries of the Missouri River. The Dakota sandstone of Cretaceous age is the oldest formation tapped...
Surface waters of Illinois River basin in Arkansas and Oklahoma
L.L. Laine
1959, Open-File Report 59-76
The estimated runoff from the Illinois River basin of 1,660 square miles has averaged 1,160,000 acre-feet per year during the water years 1938-56, equivalent to an average annual runoff depth of 13.1 inches. About 47 percent of the streamflow is contributed from drainage in Arkansas, where an average of 550,000...