00658nam a2200205Ia 4500 CTU_78360 210402s9999 xx 000 0 und d 385 A143 Aberle, W. Hamm G. Economic prospects for railways : Report of the thirty-ninth round table on Transport Economics, held in Paris on 19th and 20th October, 1977... W. Hamm G. Aberle Paris European Conference of Ministers of Transport 1978 Railroads Economic aspects Europe Trung tâm Học liệu Trường Đại học Cần Thơ