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ventilation at coal mines

Coal Mining Methods - Colorado School of Mines

Other underground coal mines are laid out in a checkerboard of rooms and pillars (Fig. 2), and the mining operation involves cyclical, step by-

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Ch. 6: Ventilation and Cooling of Shelters - Nuclear War ...

Ch. 6: Ventilation and Cooling of Shelters CRITICA IMPORTANC If high-protection-factor shelters or most other shelters that lack adequate forced ventilation were fully occupied for several days in warm or hot weather, STOPPI O RESTRICTI

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