University of Illinois Urbana-Champaign

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Showing 8431–8460 of 30,943 items
Thumbnail for Sampling Frequency for Water Quality Monitoring
Sampling Frequency for Water Quality Monitoring
Harmeson, Robert H.; Barcelona, Michael J.

Thumbnail for Two illustrations of curriculum construction
Two illustrations of curriculum construction
Monroe, Walter Scott; Hindman, Darwin Alexander; Lundlin, Roy Simeon

Thumbnail for Year-book for 1907.
Year-book for 1907.
Illinois State Geological Survey