Improvement of reliability of open-cast mining techniques in difficult geological, mining and climatic conditions / transmitted by the Government of Bulgaria.
1982
تفصيلات التسجيلة (السجل)
رمز / رقم الاستدعاء[E/ECE/]COAL/GE.4/R.20/Add.1
العنوانImprovement of reliability of open-cast mining techniques in difficult geological, mining and climatic conditions / transmitted by the Government of Bulgaria.
المؤلفونBulgaria
تاريخGeneva : UN, 11 Mar. 1982.
الوصف
5 p. : chart