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A case study of surface crown pillars: the Niobec Mine / Une étude de cas de piliers de surface : la mine Niobec; Bétournay, M C; Yu, Y S; Thivierge, S. Canada Centre for Mineral and Energy Technology, Mining Research Laboratories, Division Report MRL 87-14 (OPJ), 1987, 14 pages, Open Access logo Open Access

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