The species concept in palaentology : a symposium edited for the association 

 - London  The Systematics Association  1956 
 - vi,145p.  22cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Paleontology
<br/><br/><label>LC Class. No.: </label>QH83.A8 No.2