University of Illinois Urbana-Champaign

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Showing 6031–6060 of 11,378 items
Thumbnail for Oil and gas development in Illinois in 1941
Oil and gas development in Illinois in 1941
Bell, Alfred Hannam; Cohee, George Vincent

Thumbnail for Upper Rock River area assessment
Upper Rock River area assessment
Illinois Department of Natural Resources, Office of Scientific Research; Illinois Department of Natural Resources, Illinois State Water Survey