Official Route Numbering for the National System of Interstate and Defense Highways1958-06-27unknownhttp://rightsstatements.org/vocab/NKC/1.0/enghttp://congressarchives.org/record/CAC_CC_031_14_0000_1_29The document represents a map official route numbering as adopted by the American Association of State Highway Officials. Road map (national); 23 x 29 inches; Stamped (top, right corner; red): American Association of State Highway Officials 917 National Press Building Washington 4, D. C.