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 : consolidated report / transmitted by the Government of Federal Republic of Germany.
1982
تفصيلات التسجيلة (السجل)
رمز / رقم الاستدعاء[E/ECE/]COAL/GE.4/R.19/Add.14
العنوانDrivage, 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 : consolidated report / transmitted by the Government of Federal Republic of Germany.
المؤلفونGermany, Federal Republic of
تاريخGeneva ; UN, 26 Feb. 1982.
الوصف
22 p. : charts