Clark, Thomas Henry,  1893- <br/><br/>
Geological evolution of North America / 
by Thomas H. Clark and Colin W. Stearn 
 - 2nd ed. 
 - New York :  Ronald Press,  1968 
 - viii, 570 p. :  ill.,  maps ;  26 cm. 
<br/><br/>Includes bibliographical references 
<br/><br/><label>LCCN: </label>68-021648 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--North America<br/>Paleontology--North America<br/>Geology, Stratigraphic