File:Stand Up Time for tunnels in civil and mining engineering as a function of RMR.jpg
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![File:Stand Up Time for tunnels in civil and mining engineering as a function of RMR.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Stand_Up_Time_for_tunnels_in_civil_and_mining_engineering_as_a_function_of_RMR.jpg/798px-Stand_Up_Time_for_tunnels_in_civil_and_mining_engineering_as_a_function_of_RMR.jpg)
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