Traffic Density On Oklahoma State And Federal Aid Highways1930-01-01unknownhttp://rightsstatements.org/vocab/NKC/1.0/enghttp://congressarchives.org/record/CAC_CC_010_13_0000_0000_3This map, titled Traffic Density On Oklahoma State And Federal Aid Highways (from the 1915-1949 series, specifically 1930-01), illustrates existing high-type pavement, secondary pavement, and unpaved roads, with an overlay depicting traffic density and use. It was created as a promotional piece by the Portland Cement Association. Dimensions: 17 x 20.