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 
 - 24p. ill. 26cm. 
 - Smithsonian contributions to zoology  no.323 .
<br/><br/><label>LCCN: </label>80-607065 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Anseriformes--Evolution<br/>Presbyornis--Evolution<br/>Birds--Evolution