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
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Details
Symbol
[E/ECE/]COAL/GE.4/R.19/Add.1
Title
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.
Authors
Date
Geneva : UN, 6 Nov. 1981.
Description
17 p. : tables