The developing science and art of minerals surveying : proceedings VIth international congress, international society for mine surveying, Harrogate, 9-13 September 1985 - International Society for Mine Surveying. International Congress 1985 : Harrogate, North Yorkshire) (Rotterdam : A. A. Balkema, 1985)
Keywords: Mine surveying -- Congresses; Mine and mineral resources -- Congresses; Ground control (Mining) -- Congresses