The national parks.
Foreword by George B. Hartzog, Jr.
APA Citation
Tilden, F. (19761951). The national parks. [2d rev. ed.] New York: Knopf.
MLA Citation
Tilden, Freeman, 1883-1980. The National Parks. [2d rev. ed.] New York: Knopf, 19761951.
Warning: These citations may not always be complete (especially for serials).