Siemens, Alfred H. <br/><br/>
The Americas a comparative introduction to geography / 
Alfred H. Simens 
 - North Scituate, Mass. :  Duxbury Press,  1977 
 - xiii, 262 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>ISBN: </label>0878721282 
<br/><br/><label>LCCN: </label>77-2300 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--North America