University of Illinois Urbana-Champaign

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Showing 9931–9960 of 15,647 items
Thumbnail for Upper Rock River area assessment
Upper Rock River area assessment
Illinois Department of Natural Resources, Office of Scientific Research; Illinois Department of Natural Resources, Illinois State Water Survey

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.