Better use of available coal resources and increased economy and efficiency of coal extraction techniques : note / by the Secretariat.
1981
详细记录
符号[E/]ECE/COAL/58
标题Better use of available coal resources and increased economy and efficiency of coal extraction techniques : note / by the Secretariat.
日期Geneva : UN, Apr. 1981.
描述
1 p.
备注
Transmits document [E/ECE/]COAL/GE.5/R.14.