University of Illinois Urbana-Champaign

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Showing 1261–1290 of 44,369 items
Thumbnail for Development of paleobotany in the Illinois Basin
Development of paleobotany in the Illinois Basin
Phillips, Tom Lee; Pfefferkorn, Hermann W.; Peppers, Russel A.

Thumbnail for Quality of surface water in Illinois, 1956-1966
Quality of surface water in Illinois, 1956-1966
Harmeson, Robert Harold; Larson, Thurston Eric

Thumbnail for Economic effects of controls on nitrogen fertilizer
Economic effects of controls on nitrogen fertilizer
Swanson, Earl Raymond; Taylor, Charles Robert; Van Blokland, P.J.