Cite

Sketch map, British Columbia. Great natural divisions.

MLA

Sketch Map, British Columbia. Great Natural Divisions. The Bureau of Information?], 1919. https://collections.library.yale.edu/catalog/15536339.

APA, 6th edition

Sketch map, British Columbia. Great natural divisions. (1919). [Maps]. The Bureau of Information?], https://collections.library.yale.edu/catalog/15536339.