Clarkson, E N K <br/><br/>
Invertebrate palaeontology and evolution 

 - 2 
 -  ELBS, London  1986 
 - 379 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fossil invertebrates
<br/><br/><label>Dewey Class. No.: </label>562  CLA-I2