Lee, R. F. (1972). Family tree of the national park system: A chart with accompanying text designed to illustrate the growth of the national park system, 1872-1972. Eastern National Park & Monument Association.
Chicago Style (17th ed.) CitationLee, Ronald F. Family Tree of the National Park System: A Chart with Accompanying Text Designed to Illustrate the Growth of the National Park System, 1872-1972. Philadelphia: Eastern National Park & Monument Association, 1972.
MLA (9th ed.) CitationLee, Ronald F. Family Tree of the National Park System: A Chart with Accompanying Text Designed to Illustrate the Growth of the National Park System, 1872-1972. Eastern National Park & Monument Association, 1972.
Warning: These citations may not always be 100% accurate.