Planning and Transport Research and Computation (International) Co. Meeting Seminar H. & PTRC Education and Research Services. (1987). Developing countries: Highway construction : proceedings of Seminar H held at the PTRC Transport and Planning Summer Annual Meeting, University of Bath, England, from 7-11 September 1987. PTRC Education and Research Services Ltd. on behalf of Planning and Transport Research and Computation (International) Co..

Planning and Transport Research and Computation (International) Co. Meeting Seminar H. and PTRC Education and Research Services. Developing Countries: Highway Construction : Proceedings of Seminar H Held at the PTRC Transport and Planning Summer Annual Meeting, University of Bath, England, from 7-11 September 1987. London: PTRC Education and Research Services Ltd. on behalf of Planning and Transport Research and Computation (International) Co., 1987.

Planning and Transport Research and Computation (International) Co. Meeting Seminar H. and PTRC Education and Research Services. Developing Countries: Highway Construction : Proceedings of Seminar H Held at the PTRC Transport and Planning Summer Annual Meeting, University of Bath, England, from 7-11 September 1987. PTRC Education and Research Services Ltd. on behalf of Planning and Transport Research and Computation (International) Co., 1987.