1. National highways preliminary map of the State of Minnesota : showing twenty-six hundred miles of national highways : proposed by the National Highways Association, Washington, D.C. Maps University Of Minnesota Public content 1916. National Highways Association. Cartographic Details: Scale approximately 1:1,560,000 (W 97 ̊15 ́--W 89 ̊30 ́/N 49 ̊23 ́--N 43 ̊30)́. In upper margin: Good roads everywhere : four... The Association (Washington, D.C.).