Keywords: US 31A Michigan 1948.svg en 16x16 U S route shield approximated to the 1948 standards 2014-06-08 18 43 15 Based on File US 66 Arizona 1926 svg Original design by the w American Association of State Highway Officials file by Imzadi1979 PD-USGov 1948 Michigan U S Highway shields 031A Uploaded with UploadWizard |