Southwest Circle Tour roads and bridges :
Zion, Bryce, Grand Canyon North Rim national parks, Cedar Breaks, Pipe Spring national monuments, Kaibab, Dixie national forests.

APA Citation

United States. National Park Service. (1994). Southwest Circle Tour roads and bridges: Zion, Bryce, Grand Canyon North Rim national parks, Cedar Breaks, Pipe Spring national monuments, Kaibab, Dixie national forests. [Washington, D.C.?]: U.S. Dept. of the Interior, National Park Service.

MLA Citation

United States. National Park Service. Southwest Circle Tour Roads And Bridges: Zion, Bryce, Grand Canyon North Rim National Parks, Cedar Breaks, Pipe Spring National Monuments, Kaibab, Dixie National Forests. [Washington, D.C.?]: U.S. Dept. of the Interior, National Park Service, 1994.