This map shows tentative locations for a system of 100,000 miles of national highways.; "Issued under the joint auspices of the National Highways Association."41 x 66 centimetersJPEGUMN_ALMA:9952857330001701engNational Highways Association (Washington, D.C)PublicNational highways map of the United States showing one hundred thousand miles of national highways proposed by the National Highways AssociationMapsUnited StatesUniversity of Minnesota