University of Illinois Urbana-Champaign

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Showing 121–150 of 292 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 Illinois birds: Hirundinidae
Illinois birds: Hirundinidae
Graber, Richard Rex; Graber, Jean Weber; Kirk, Ethelyn L.