University of Illinois Urbana-Champaign

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Showing 901–930 of 17,407 items
Thumbnail for The geology of Hardin County, and the adjoining part of Pope County.
The geology of Hardin County, and the adjoining part of Pope County.
Weller, Stuart; Butts, Charles; Currier, Louis W.; Salisbury, Rollin D.

Thumbnail for Potash shales of Illinois
Potash shales of Illinois
Parr, Samuel Wilson; Krey, Frank; Austin, Miner Manly; Stewart, Robert