Easton, William Heyden,  1916- <br/><br/>
Invertebrate paleontology 
by W. H. Easton 
 - New York  Harper & Row  1960 
 - 701 p. : ill. ; 25 cm. 
<br/><br/>Includes bibliography. 
<br/><br/><label>LCCN: </label>59-013921 /L 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Invertebrates, Fossil