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2. Illinois State Water Survey . 1976 . Addendum 1 to Testimony of William C . Ackermann regarding Water Resources of Northeast Illinois with Respect to Allocation of Lake Michigan Diversion Water.
3. R. S. McLeod, 1975 . A digital-computer model for estimating drawdown in the sandstone aquifer in Dane County, Wisconsin . Wisconsin Geological and Natural History Survey Inf. Circular 28. 91 pp.
4. G. F. Pinder, 1970 . An iterative digital model for aquifer evaluation . U.S. Geol. Survey Open File Report. 44 pp.
5. R. T. Sasman, C. R. Benson, J. S. Mende, N. F. Gaugler, and V. M. Calvin . 1977 . Water level decline and pumpage in deep wells in the Chicago region, 1971-1975 . Illinois State Water Survey Circular 125.