Orvig, Tor, Ed. <br/><br/>
Current problems of lower vertebrate phylogeny 

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 - John Wiley  & Sons, New York  1968 
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<br/><br/><label>ISBN: </label>  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Animal taxonomy-- Zoology
<br/><br/><label>Dewey Class. No.: </label>590.12  ORV-C