University of Illinois Urbana-Champaign

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Showing 661–690 of 5,123 items
Thumbnail for Chemical characteristics of banded ingredients of coal
Chemical characteristics of banded ingredients of coal
Rees, Orin Wainwright; Wagner, William Frederick; Tilbury, Wilbur Glenn, joint author

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.