Ogburn, Charlton <br/><br/>
The forging of our continent. 
Consultant: William G. Melson. 
 - [New York]  American Heritage Pub. Co.; distribution by Van Nostrand  [1968] 
 - 160 p.  illus., maps, ports. 
 - The Smithsonian library .
<br/><br/> Part of the illustrated matter is colored. 
<br/><br/>Bibliography: p. 155. 
<br/><br/><label>LCCN: </label>68022959  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--North America.
<br/><br/><label>LC Class. No.: </label>QE71  / .O35 
<br/><br/><label>Dewey Class. No.: </label>557.3