Pritchard, Paul. <br/><br/>
The best idea America ever had / 
Paul Pritchard. 
 - National Geographic Society :  Washington,  [s.f.]. 
 -  fot. ;  25 cm 
<br/><br/><label>ISSN: </label>00279358 
<br/><br/><label>Subjects--Index Terms: </label>Parques nacionales (Estados Unidos)