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2
-
The economics of road user charges / A.A. Walters.
- International Bank for Reconstruction and Development,
- cop. 1968.
- Washington, DC :
-
Road user charges in Central America / Anthony Churchill ; in collab. with Klaus Huber, Elke Meldau and Alan Walters.
- 876
- International Bank for Reconstruction and Development,
- cop. 1972.
- Washington, DC :