Shrock, Robert R; Twenhofel, William H <br/><br/>
Principles of Invertebrate palaeontology  

 - 2 
 -  CBS Publishers & Distributors, New Delhi  1987 
 - 816 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fossil invertebrates
<br/><br/><label>Dewey Class. No.: </label>562  SHR-P2