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History of the National Park Service (Infographic) - Park Chasers
Route 66 road trip guide with interactive maps - Roadtrippers
Travel Route 66 (U.S. National Park Service)
5. Demise and Resurgence of Interest in Route 66 (U.S. National Park Service )
10 Amazing National Parks Along Route 66 - The National Parks Experience
Historic Route 66 - Petrified Forest National Park (U.S. National Park Service)
The ultimate Western US road trip
Visit - Travel Route 66 (U.S. National Park Service)
2. Before 1926: The Origins of Route 66 (U.S. National Park Service)