Keywords: Official Map - Nebraska State Highway System (1940).png en Official 1940 map of the Nebraska state highway system; as published by the State of Nebraska Department of Roads Irrigation Bureau of Roads and Bridges 1940-04-01 http //www transportation nebraska gov/maps/historical/pdf/1940 20Map pdf Nebraska Department of Roads Irrigation other versions Custom license marker 2015 05 23 PD-EdictGov Uploaded with UploadWizard Nebraska in the 1940s Maps of the history of the United States Maps of Nebraska |