APA (7th ed.) Citation

United States. National Park Service. (1926). Nineteen national parks and 32 monuments administered by National Park Service, and principal railroad connection. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. National Park Service. Nineteen National Parks and 32 Monuments Administered by National Park Service, and Principal Railroad Connection. [Place of publication not identified]: [publisher not identified], 1926.

MLA (9th ed.) Citation

United States. National Park Service. Nineteen National Parks and 32 Monuments Administered by National Park Service, and Principal Railroad Connection. [publisher not identified], 1926.