International Mine Ventilation Congress (3rd 1984 Harrogate, North Yorkshire)

International Mine Ventilation Congress (3rd 1984 Harrogate, North Yorkshire)

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Third International Mine Ventilation Congress, Harrogate, 1984International Mine Ventilation Congress (3rd 1984 Harrogate, North Yorkshire)

Third International Mine Ventilation Congress, Harrogate, 1984

International Mine Ventilation Congress (3rd 1984 Harrogate, North Yorkshire) · 1984