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NGUYEN , C.K., NGUYEN , V.T., NGUYEN , P.H. i NGUYEN , V.Q. 2021. A Solution to Ensure Ventilation when Expanding the Area of Cam Thanh Underground Coal Mine, Ha Long Coal Company, Vietnam. Inżynieria Mineralna. 1, 2 (grudz. 2021). DOI:https://doi.org/10.29227/IM-2021-02-51.