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| collapsed rocks (1) |
| deformation-strength characteristics (1) |
| preparatory mine working (1) |
| roof rocks rigidity (1) |
| stress-strain state (1) |
| support (1) |
| collapsed rocks (1) |
| deformation-strength characteristics (1) |
| preparatory mine working (1) |
| roof rocks rigidity (1) |
| stress-strain state (1) |
| support (1) |