Partial map of the southwestern United States (Oklahoma, Texas, New Mexico) wih roads and highways hand drawn and numbered in red and black ink. Part of United States Highway 66 is numbered and drawn in black ink, while part is numbered as 60 and...
Interstate Highway System -- Maps.
United States -- Maps.
United States System of Highways
Adopted for uniform marking by the American Association of State Highway Officials
November 11, 1926
These routes are a part of the Federal Aid Highway System approved by the Secretary of Agriculture