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International Conference on stability in underground mining <1. ; 1982
International conference on Stability in underground mining <2. ; 1984
Symposium on the theoretical background to the planning of open pit mines with special reference to slope stability <1970
Hardwick, William R.
Hardwick, William R.
Hardwick, William R.
Hardwick, William R.
International conference Silver-exploration mining and treatment <1988
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