University of Illinois Urbana-Champaign

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Showing 1291–1320 of 2,514 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 An interdisciplinary study of environmental pollution by lead and other metals
An interdisciplinary study of environmental pollution by lead and other metals
University of Illinois at Urbana-Champaign. Institute for Environmental Studies