Improvement of reliability of opencast mining techniques in difficult geological, mining and climatic conditions / transmitted by the Government of Poland.
1983
شكل
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رمز / رقم الاستدعاء
[E/ECE/]COAL/GE.4/R.20/Add.3
العنوان
Improvement of reliability of opencast mining techniques in difficult geological, mining and climatic conditions / transmitted by the Government of Poland.
المؤلفون
تاريخ
Geneva : UN, 13 June 1983.
الوصف
8 p.