Mayr, Gerald. <br/><br/>
Paleogene fossil birds  [electronic resource] / 
by Gerald Mayr. 
 - Berlin, Heidelberg :  Springer-Verlag Berlin Heidelberg,  2009. 
 - xiii, 262 p. :  ill., digital ;  24 cm. 
<br/><br/><label>ISBN: </label>9783540896289 (electronic bk.) 9783540896272 (paper) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Birds, Fossil.<br/>Paleontology--Paleogene.<br/>Life Sciences.<br/>Paleontology.<br/>Vertebrates.<br/>Zoology.<br/>Animal Systematics/Taxonomy/Biogeography.<br/>Evolutionary Biology.