Improvement of signalling and telecommunication in the railway systems of the region where electric power supply and adequate transmission lines are not available.
1980
详细记录
符号[E/ESCAP/]TRANS/IRGM/(2)/3
标题Improvement of signalling and telecommunication in the railway systems of the region where electric power supply and adequate transmission lines are not available.
日期[Bangkok] : UN, 25 Apr. 1980.
描述
[63] p. : ill., charts, tables.