The national parks portfolio, 
by Robert Sterling Yard. 
 - [2d ed.] 
 - Washington,  U.S. Govt. Print. Off.,  1917. 
 - 1 v. (various pagings),  illus. 
<br/><br/> At head of title: Department of the interior, Franklin K. Lane, secretary. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>National parks and reserves--United States.