Coal-getting systems not requiring the presence of men at the face at all times and methods of working coal which do not require the presence of men underground : consolidated report / transmitted by the Government of Union of Soviet Socialist Republics.
1982
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Symbol
[E/]ECE/COAL/73
Title
Coal-getting systems not requiring the presence of men at the face at all times and methods of working coal which do not require the presence of men underground : consolidated report / transmitted by the Government of Union of Soviet Socialist Republics.
Authors
Date
Geneva : UN, 10 Mar. 1982.
Description
1 p.