The national parks portfolio
By: by Robert Sterling Yard.
Contributors: Yard, Robert Sterling, 1861-1945.; Story, Isabelle F. 1888-1970.
Edition: 6th ed.  Revised by Isabelle F. Story.
Publisher: U.S. Govt. Print. Off.
Published: 1931
Place of publication: Washington
Language: eng
Number of pages: 274
Subjects: National parks and reserves -- United States.