According to the Biographical Dictionary of Architects in Canada, S. H. Maw was “a brilliant delineator, etcher, architect, cartographer and designer” who lived everywhere from England to Ontario, and there is not a more colourful, explanatory, or detailed pictorial map of Montréal than this one made by him. It was drawn in 1942 for that city’s tercentenary celebrations, a time when he was teaching Architectural Rendering at McGill. See also Maw’s City of Quebec 1932 view (with very much the same style and approach, and also in the Civic Atlas’ collection) and let me know if you ever find his 1944 Ottawa illustration. I’d love to see it. Reprints sold with a half-inch margin, unframed.