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Projection of population and highway traffic in Minnessota : Minnesota higway research project
Borchaert, John R., (1963)
Rural traffic flow map, 1955 : state of Oregon ; volumes shown are all vechicle average daily traffic
(1955)
Mobility and the small town, 1900 - 1930 : transportation change in Oregon, Illinois
Moline, Norman T., (1971)