1. Geological map of a portion of northwestern Ontario, traversed by the National Transcontinental Railway, between Lake Nipigon & Sturgeon Lake to illustrate report by W.H. Collins, B.A., 1906 / [cartographic material] Yale Public content 1906. 2018-06-19T20:13:28Z. 2018-09-05T20:09:01Z. Senécal, C. O. (Clovis Omer). Dept. of Mines, Geological Survey Branch. English. cartographic image. Public. Ontario and Thunder Bay (District).