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

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.

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

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.

This series contains various biographical material compiled on John Smith Archibald and Charles Jewett Saxe.

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.

Series contains the entries for the Public 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, which offer architectural examples that influenced the Maxwell projects and their public commissions.

Series contains the entries for the Canadian Pacific Railway Series, a book project of France Gagnon-Pratte, including a manuscript of the book, photographs, drawings and texts concerning various stations and landmark hotels along the Canadian Pacific Railway line across Canada.