The Roger Doucet Collection consists of over 1000 pieces of sheet music (including scores), 45 manuscripts, and one scrapbook containing photographs and newspaper clippings related to his career as the singer of “O Canada” during professional sports games.

The collection was formed by the Canadian puppeteer Rosalynde Osborne Stearn as a comprehensive library on the puppet theatre with representative examples of puppets characteristic of different periods and countries. It includes some 2714 books and periodicals from the nineteenth and twentieth centuries on the puppet theatre in various European languages as well as scripts for puppet plays. The collection contains 171 puppets from Europe, Asia (including shadow puppets), and the Americas, from the eighteenth to the twentieth centuries. Also included are toy theatres, theatrical portraits, paintings, prints and posters.

The fonds consists of books and other materials about Black people in history and contemporary society which Roy States collected from his teenage years to the end of his life. The materials are primarily English-language works produced during his lifetime, and the majority of them are from Canada or the United States. The physically largest series within the collection (Series B, Monographs) consists of 679 published volumes, most of them books and a smaller number of them booklets. These volumes are all catalogued individually, with a common sublocation of "Roy States Collection" within Rare Books and Special Collections. The remaining series contain a diversity of published, ephemeral, and unpublished materials, including various items by or about Roy States himself. Series A is a group of biographical materials and other items which relate directly to States. Series C consists of booklets and brochures. Series D consists of complete issues of newspapers, and Series E consists of complete issues of serials other than newspapers. Series F contains an assortment of newspaper and magazine clippings, as well as reprinted or photocopied extracts from books, journals and other works. Series G contains materials relating to conferences and meetings, chiefly involving groups and organizations advocating for civil rights; the materials include programs, agendas, minutes and reports, as well as the text of various speeches presented at these events. Series H consists primarily of graphic materials which have been mounted in cardboard-and-plastic display sleeves or in glass-fronted wooden frames. Series I is a group of miscellaneous materials such as studies, reports, typescripts, bibliographies and leaflets.

Collection includes the Minute Books of the Committee of Management of the Hospital, 1844-1926; a letter book, 1886-1896; Annual Reports 1887-1926; Medical Board Minutes, 1905-1918; Record of Pupil Nurses from R.V.H., 1908-1923; Annual Reports of the Auxiliary Board, Women's Pavillion, 1929-1943; Obstetrical and Gynaecological Report of the Royal Victoria Montreal Maternity Hospital, 1950-1960 and a copy of "Royal Victoria Montreal Maternity Hospital" by C.V. Barrett and J.R. Fraser, 1943.

Book of memoranda on road making and farming at Saint Gervais, 1799-1806.

There are three letters from Lord Selkirk, one from Lord Dalhousie, and eight from Lady Selkirk. The early letters concern the Red River Settlement and the North West Company. The letter from Lord Dalhousie, 1824, concerns legal matters, and the two late letters, 1828 and 1833, from Lady Selkirk are personal in nature.

The collection consists of 38 letters written by a small group of French Canadian Protestant friends living in the villages of St. Philippe, Grande Ligne, and Ste. Philomène in southern Quebec, as well as in the city of Montreal. Among the letters are those by Samuel Perrier, a Quebec farmer and dedicated letter writer, primarily addressed to his future wife, Eugenie Molleur (1862–1948), and to one of his daughters, Aline, who attended L'Institut Méthodiste Français.

These letters provide a vivid depiction of the challenging rural life faced by Quebec farmers, highlighting issues such as fatigue, poor crop yields, a shortage of farm labour, harsh winters, health struggles, and local news. They also reflect the parents' determination to improve their children's futures by sending them to school to learn English, accounting, music, and teaching. The collection additionally includes a small selection of poems and songs.

The collection consists of reports and plans for urban and rural areas from all provinces of Canada and some international cities, including Boston, New York, Chicago, France, and London, dating from the late 1950s to the 1990s. Most of the material consists of plans and reports for future land-uses that are revised, usually every decade. It also includes regulations for these areas, such as zoning. Some reports deal with sectorial policies such as housing, transportation, conservation, or environmental protection.

The collection consists of programs and recordings of ensemble performances (including opera) by students, faculty members, and guest artists associated with the Schulich School of Music at McGill University and performed at one of the School's halls (Pollack Hall, Redpath Hall, Tanna Schulich Hall, and Clara Lichtenstein Hall), as well as some performances at venues outside McGill.