Family tree of the national park system
Subtitle: a chart with accompanying text designed to illustrate the growth of the national park system, 1872-1972
By: by Robert F. Lee.
Publisher: Eastern National Park & Monument Association
Published: 1972
Place of publication: Philadelphia
Language: eng
Number of pages: 93
Subjects: United States. National Park Service.; National parks and reserves -- United States.; Historic sites -- United States.