University of Illinois Urbana-Champaign

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Showing 2041–2070 of 2,775 items
Thumbnail for Geology and geography of the Galena and Elizabeth Quadrangles.
Geology and geography of the Galena and Elizabeth Quadrangles.
Trowbridge, Arthur C.; Shaw, Eugene Wesley; Schockel, Bernard Henry

Thumbnail for Big Rivers area assessment
Big Rivers area assessment
Illinois Department of Natural Resources. Office of Scientific Research and Analysis; Illinois Department of Natural Resources. State Geological Survey Division