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Lansdowne, VA: Eno Transp. Found., 1998
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Washington, DC: [ENO Transportation Foundation], [2000]
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Saugatuck, Conn.: The Eno Foundation for Highway Traffic Control, 1961
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New York, NY [u.a.]: [Verlag nicht ermittelbar], 1947-1981 / 1.1947 - 35.1981
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Westport, Conn.: Eno Foundation for Transportation, 1985
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Westport, Conn,: Eno Foundation for Transportation, 1986
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Westport, Conn.: Eno Foundation for Transportation, 1985