Collection search - Plan of Jos. Oborn's coal mine, Milk River, Alberta, operating under coal sale no. 694M., dated 3rd April, 1907, which includes W 1/2 Sec. 31, Tp. 2, Rg. 15, W 4th. M. Surveyed 6th August, 1915 by O. S. Finnie, D. L. S., Inspecting Engineer, M. L. and Y. Br. [Mining Lands and Yukon Branch], Department of Interior - Ottawa. Survey extended ... 1916 ... 7th August, 1917. [cartographic material]