Babcock, H. M., Visher, F. N. 1., & Durum, W. H. 1. (1951). Reconnaissance of the geology and ground-water resources of the Pumpkin Creek area, Morrill and Banner counties, Nebraska. Lincoln, Nebraska: U.S. Geological Survey, Water Resources Division.

Babcock, H. M., F. N. 1923- Visher, and W. H. 1917-1996 Durum. Reconnaissance of the Geology and Ground-water Resources of the Pumpkin Creek Area, Morrill and Banner Counties, Nebraska. Lincoln, Nebraska: U.S. Geological Survey, Water Resources Division, 1951.

Babcock, H. M., F. N. 1923- Visher, and W. H. 1917-1996 Durum. Reconnaissance of the Geology and Ground-water Resources of the Pumpkin Creek Area, Morrill and Banner Counties, Nebraska. Lincoln, Nebraska: U.S. Geological Survey, Water Resources Division, 1951.