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2. Economic and Transport Consultants Road Transport Subsector Study. Ministry of Transport and Communications, 1987.
3. Kesse-Tagoe Associates/Transportation and Development Planning Consultancy Ltd. “Traffic and Transportation in Studies of Accra”. Ministry of Transport and Communications, 1988.
4. Olu-Davies, J. “Journey-to-work Study of Accra” Unpublished BSc Special Study. University of Science and Technology, Kumasi, 1982.