Current problems of lower vertebrate phylogeny  proceedings of the Fourth Nobel Sympopsium held in June 1967 at the Swedish Museum of Natural History (Naturhistoriska riksumuseet) in Stockholm 
Edited by Tor Orvig 
 - Stockholm  Almqvist Wiksell International  1968 
 - 539 p. : ill., plates ; 24 cm. 
 - Nobel symposium  4 .
<br/><br/> 'Sponsors: The Nobel Foundation and others' 
<br/><br/>Includes bibliographies. 
<br/><br/><label>LCCN: </label>68-09446 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vertebrates--Congresses<br/>Phylogeny--Congresses