Map Showing Condition of Improvement of the State Highway System, Oklahoma1941-04-01unknownhttp://rightsstatements.org/vocab/NKC/1.0/enghttp://congressarchives.org/record/CAC_CC_053_4_0000_1_13Road map by the State Highway Commission: This map features a legend detailing road materials, names of major highways, and markings with dates for specific highways. Dimensions: 20 x 26 3/4.