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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, 1984
International 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