Olson, Storrs L. <br/><br/>
Presbyornis and the origin of the Anseriformes (Aves, Charadriomorphae) / 
Storrs L. Olson and Alan Feduccia 
 - Washington :  Smithsonian Institution Press,  1980 
 - iii, 24 p. :  ill. ;  26 cm. 
 - Smithsonian contributions to zoology ;  no. 323 .
<br/><br/>Bibliography: p. 23-24 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Anseriformes--Evolution<br/>Presbyornis--Evolution<br/>Birds--Evolution
<br/><br/><label>Dewey Class. No.: </label>591