Cite

Duncan sheet, Vancouver Island, British Columbia / C.O. Senécal, geographer and chief draughtsman ; G.G. Aitken, draughtsman.

MLA

of Canada, Geological Survey. Duncan Sheet, Vancouver Island, British Columbia / C.O. Senécal, Geographer and Chief Draughtsman ; G.G. Aitken, Draughtsman. Canada Dept. of Mines, Geological Survey, 1915. https://collections.library.yale.edu/catalog/15536292.

APA, 6th edition

of Canada, G. S. (1915). Duncan sheet, Vancouver Island, British Columbia / C.O. Senécal, geographer and chief draughtsman ; G.G. Aitken, draughtsman. [Maps]. Canada Dept. of Mines, Geological Survey, https://collections.library.yale.edu/catalog/15536292.