Hartzog, George <br/><br/>
The national parks/ 
George Hartzog. 
 - New york :  1951. 
 - xviii, 560 p. : 
<br/><br/> includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>national parks
<br/><br/><label>LC Class. No.: </label>E 160.T5 1951