Use of Vertical Boreholes for Assisting Ventilation of Longwall Gob Areas
Use of Vertical Boreholes for Assisting Ventilation of Longwall Gob AreasCurtis H. Elder
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Use of Vertical Boreholes for Assisting Ventilation of Longwall Gob Areas

Use of Vertical Boreholes for Assisting Ventilation of Longwall Gob Areas

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