Collection search - Plan of Three Hills Coal Mine - Three Hills - Alberta - operating L.S.1. Sec.35. Tp.31. Rg. 24. W4th M. Surveyed 14th Sept. 1911 by O.S. Finnie, Inspecting Engineer, Dept. Interior, Ottawa. Mine closed 1st May 1913. Survey extended 16th Sep. 1912. Survey extended 7th June 1912. [cartographic material]

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