Exploring America's valleys :  from the Shenandoah to the Rio Grande / 
prepared by the Special Publications Division, National Geographic Society. 
 - Washington, D.C. :  National Geographic Society,  [c1984] 
 - 199 pages  cooured illustrations  26 cm. 
<br/><br/> Includes index. 
<br/><br/>Bibliography: p. 199. 
<br/><br/><label>ISBN: </label>087044476X :  $6.95 0870444816 (lib. bdg.) :  $8.50 
<br/><br/><label>LCCN: </label>84006804  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Valleys--United States.
<br/><br/><label>LC Class. No.: </label>GB 564  / .E9 
<br/><br/><label>Dewey Class. No.: </label>917.30944