1913. National Highways Association. Published under direction of General Coleman du Pont, Chairman Board of Councillors.; "This map shows tentative locations for a national highways s... National Highways Association (Washington, D.C).
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1926. National Highways Association. Bordered by textual information associated with the National Highways Association.; "4 fold system of highways."; "Facts in the history of road bui... National Highways Association (Washington, D.C).
1916. National Highways Association. Includes information on the population to be served and other notes.; "Good roads everywhere, four fold system of highways."; "April 1916." 32 x 54... National Highways Association (Washington, D.C).