(1989). Shaft engineering: Papers presented at the shaft engineering conference, organized by the Institution of Mining and Metallurgy in association with the Institution of Civil Engineers and the Institution of Mining Engineers, and held in Harrogate, England, from 5 to 7 June, 1989. London: Institution of Mining and Metallurgy.
Παραπομπή Chicago StyleShaft Engineering: Papers Presented At the Shaft Engineering Conference, Organized By the Institution of Mining and Metallurgy in Association With the Institution of Civil Engineers and the Institution of Mining Engineers, and Held in Harrogate, England, From 5 to 7 June, 1989. London: Institution of Mining and Metallurgy, 1989.
Παραπομπή MLAShaft Engineering: Papers Presented At the Shaft Engineering Conference, Organized By the Institution of Mining and Metallurgy in Association With the Institution of Civil Engineers and the Institution of Mining Engineers, and Held in Harrogate, England, From 5 to 7 June, 1989. London: Institution of Mining and Metallurgy, 1989.