Shrock, Robert. <br/><br/>
Principles of invertebrate paleontology / 
by Robert R. Shrock and William H. Twenhofel. 
 - New Delhi :  C. B. S. Publishers, 
 - 806 p.;  Pbk 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Paleontology<br/>Invertebrate
<br/><br/><label>Dewey Class. No.: </label>596  / SHR