Improvement of reliability of open-cast mining techniques in difficult geological, mining and climatic conditions / transmitted by the Government of Bulgaria.
1982
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Details
Symbol[E/ECE/]COAL/GE.4/R.20/Add.1
TitleImprovement of reliability of open-cast mining techniques in difficult geological, mining and climatic conditions / transmitted by the Government of Bulgaria.
AuthorsBulgaria
DateGeneva : UN, 11 Mar. 1982.
Description
5 p. : chart