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Bonn: Bundesmin. f. Verkehr, Abt. Strassenbau, 1970
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Berlin: Ed. Sigma Bohn, 1986
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Washington, D.C.: Brookings Inst., 1989
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Cambridge, Mass: National Bureau of Economic Research, 2021
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Cambridge, Mass: National Bureau of Economic Research, 2021
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Cambridge, Mass: National Bureau of Economic Research, December 2023
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Cambridge, Mass: National Bureau of Economic Research, September 2023