National Parks Association. Washington. <br/><br/>
Golden anniversary / 
National Parks Association. Washington. 
 - Washington :  [s. n.],  [s. a.]. 
 - 1 sheet : two-sided, text :   ill. ;  23x50 cm, 23x10 cm. 
 - 712.253(73) (NLA) .
<br/><br/><label>Subjects--Topical Terms: </label><br/>National parks--USA.
<br/><br/><label>Universal Decimal Class. No.: </label>712.253(73) (NLA)