Simpson, George Gaylord. <br/><br/>
Life of the past :  an introduction to paleontology / 
by George Gaylord Simpson. 
 - New Haven :  Yale University Press,  c1953. 
 - xii, 198 p. ;  ill. ;  21 cm. 
<br/><br/> Includes index. 
<br/><br/>Bibliography: p. 186 - 187. 
<br/><br/><label>LCCN: </label>52-12078 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Paleontology.