University of Illinois Urbana-Champaign

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Showing 4261–4290 of 22,616 items
Thumbnail for Oil investigations in 1917 and 1918
Oil investigations in 1917 and 1918
Illinois State Geological Survey; Barrett, Nellie Okla; Nebel, Merle Louis; Coryell, Horace Noble; Tough, Fred H.; Williston, Samuel H.; Savage, Thomas Edmund

Thumbnail for Douglas County soils / 43
Douglas County soils / 43
Smith, Raymond Stratton

Thumbnail for Limestone resources of Adams and Brown Counties, Illinois
Limestone resources of Adams and Brown Counties, Illinois
Goodwin, Jonathan H.; Harvey, Richard D.