University of Illinois Urbana-Champaign

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Thumbnail for Hydrogeologic and geochemical studies of selected natural radioisotopes and barium in groundwater in Illinois
Hydrogeologic and geochemical studies of selected natural radioisotopes and barium in groundwater in Illinois
Gilkeson, Robert H.; Cartwright, Keros; Cowart, James B.; Holtzman, Richard B.

Thumbnail for The Uses of PLATO: A Computer-Controlled Teaching System
The Uses of PLATO: A Computer-Controlled Teaching System
Bitzer, Donald L.; Lyman, Elisabeth R.; Easley, J.A., Jr.