Included are watercolours and drawings of Egypt and India as well as details and sketches of churches in England and Italy.

The photographs in the Nobbs archive document some of his architectural projects including urban domestic architecture, renovations to the interior of Christ Church Cathedral in Montreal, McGill's MacDonald Engineering Building, a proposal for Winnipeg City Hall and a proposal for a war memorial at Lille in France. Documented are plans, exteriors and interiors, models, buildings under construction and perspectives. Included are five photograph albums.

Series contains clippings related to projects executed by the firms, including the old Masonic Temple, the Engineers' Club house, the Windsor Hotel, a house for N. A. Timmins, and the École technique de Montréal.

Reports, notes and correspondence stemming from Nobbs's involvement in the Montreal Committee on Housing and Slum Clearance.

Letters from several of Nobbs' friends and colleagues, among them Sir Raymond Unwin (1934-1940), Professor G. Baldwin Brown (1893-1926), Auckland C. Geddes (1909-1953), Bertram Goodhue (1906-1935), R. S. Lorimer (1904-1924) and Noulan Cauchon (1935).

Series consists chiefly of architectural photography from Italy and France, featuring building exteriors and exteriors and details such as doorways, crests, and capitals. Photographs are mostly undated. One file contains photographs of public buildings in the United States and one photograph of a Royal Canadian Mounted Police garage in Montreal Quebec.

Series consists of manuscripts, typescripts, and correspondence regarding various personal, non-architectural projects undertaken by Nobbs, in particular the design of his deflected northern lighting system for the National Research Council.