Shrock, Robert R.. <br/><br/>
Principles of invertebrate paleontology /  
by Robert R.Shrock,William H.Twenhofel. 
 - 2nd ed /  
 - Delhi :   CBS Publishers & Distributors ,   1987 
 - xx,816p :  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Zoology
<br/><br/><label>Dewey Class. No.: </label>K1(H6)  / M7;1