Collection search - The Durham Collieries mine, Optic, Alberta, N 1/2 L.S. 2 & S 1/2 L.S. 7, Sec. 36, Tp. 14, Rg. 22 [West of 4th Mer.], sold to company; S 1/2 L.S. 2, Sec. 36, Tp. 14, Rg. 22 [West of 4th Mer.], operated by company. Aug. 1st, 1911. [cartographic material]