University of Illinois Urbana-Champaign

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Showing 31–60 of 2,887 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 Lead poisoning in wild waterfowl
Lead poisoning in wild waterfowl
Jordan, James S.; Bellrose, Frank Chapman

Thumbnail for Transfer pricing : a behavioral context / BEBR No. 120
Transfer pricing : a behavioral context / BEBR No. 120
Watson, David J.H.; Baumler, John V.

Thumbnail for Population losses in the mallard, black duck, and blue-winged teal
Population losses in the mallard, black duck, and blue-winged teal
Bellrose, Frank Chapman; Chase, Elizabeth Brown