General map of north-western Canada, showing railways and navigable waters / sg'd. John Armstrong, chief engineer, Hudson Bay R'y Surveys.
MLA
General Map of North-Western Canada, Showing Railways and Navigable Waters / Sg'd. John Armstrong, Chief Engineer, Hudson Bay R'y Surveys. s.n., 190AD. https://collections.library.yale.edu/catalog/15535569.
APA, 6th edition
General map of north-western Canada, showing railways and navigable waters / sg'd. John Armstrong, chief engineer, Hudson Bay R'y Surveys. (190 C.E.). [Maps]. s.n., https://collections.library.yale.edu/catalog/15535569.