Drivage, development and support of roadways and faces in deep mines, 1,000 metres and over, and consequently in more difficult mining, geological and atmospheric conditions / transmitted by the Government of the United Kingdom.
1981
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详细记录
符号[E/ECE/]COAL/GE.4/R.19
标题Drivage, development and support of roadways and faces in deep mines, 1,000 metres and over, and consequently in more difficult mining, geological and atmospheric conditions / transmitted by the Government of the United Kingdom.
日期Geneva : UN, 19 Oct. 1981.
描述
10, 2 p. : graph, tables