Drivage, development and support of roadways and faces in deep mines and in difficult mining and atmospheric conditions / transmitted by the Government of France.
1984
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Details
Symbol
[E/ECE/]COAL/GE.4/R.19/Add.12
Title
Drivage, development and support of roadways and faces in deep mines and in difficult mining and atmospheric conditions / transmitted by the Government of France.
Authors
Date
Geneva : UN, 23 Mar. 1984.
Description
3 p.