University of Illinois Urbana-Champaign

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Showing 1951–1980 of 2,419 items
Thumbnail for Geology and mineral resources of the Marseilles, Ottawa, and Streator quadrangles,
Geology and mineral resources of the Marseilles, Ottawa, and Streator quadrangles,
Willman, Harold Bowen; Payne, James Norman; Voskuil, Walter Henry

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