Consists of 108 undated postcards in eight files of buildings in Europe; these include examples of building exteriors, interiors and details.

Series contains the entries for the Private Buildings part of Gagnon-Pratte's 1987 book Country Houses for Montrealers, 1892-1924: The Architecture of E. and W.S. Maxwell, including photographs, drawings and texts concerning various houses designed by the architectural cabinet of E. and W.S. Maxwell.

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).

Correspondence relating to Nobbs' participation in several professional organizations, specifically the Art Association of Montreal (1916-1933), the Royal Institute of British Architects (1927-1929), the Royal Canadian Academy of Arts (1928-1939), the Royal Society of Arts (1938-1940) and the Royal Architectural Institute of Canada (1955).

Series 2 contains records that documents the professional activities of Harold Spence-Sales that are unrelated to the professional projects that he worked on. Series 2 contains records regarding Harold Spence-Sales activities within professional associations. Series 2 also holds copies of many of the articles and books Harold Spence-Sales wrote as a solo author as well as titles that he collaborated on with John Bland. Series 2 also documents Harold Spence-Sales exhibition interests. Primarily exhibitions that Harold Spence-Sales worked on. Moreover, Series 2 also contains issues of urban planning and architectural publications that were of interest to Harold Spence-Sales.

Series 2 Also contains some records related to Architects Humphrey Carver, Moshe Safdie and Peter Oberlander who were colleagues and friends of Harold Spence-Sales. These records can be found in series 2 subsereies E.