Drivage development and support of roadways and faces in deep mines - 750 metres and over - and consequently in more difficult mining, geological and atmospheric conditions / transmitted by the Government of Poland.
1981
تفصيلات التسجيلة (السجل)
رمز / رقم الاستدعاء[E/ECE/]COAL/GE.4/R.19/Add.1
العنوانDrivage development and support of roadways and faces in deep mines - 750 metres and over - and consequently in more difficult mining, geological and atmospheric conditions / transmitted by the Government of Poland.
المؤلفونPoland
معلومات عن جدول الأعمال
[E/ECE/]COAL/GE.4/9 8 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.
تاريخGeneva : UN, 6 Nov. 1981.
الوصف
17 p. : tables