University of Illinois Urbana-Champaign

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Showing 8341–8370 of 15,430 items
Thumbnail for Sex Ratios and Age Ratios in North American Ducks
Sex Ratios and Age Ratios in North American Ducks
Bellrose, Frank Chapman; Scott, Thomas G.; Hawkins, Arthur Stuart; Low, Jessop B.

Thumbnail for Proceedings: third Sanitary Engineering Conference: disinfection and chemical oxidation in water and waste treatment
Proceedings: third Sanitary Engineering Conference: disinfection and chemical oxidation in water and waste treatment
Illinois State Department of Public Health Division of Sanitary Engineering and the University of Illinois Department of Civil Engineering