The administrative records of the MCSA contain annual reports, 1921-1968; minutes of annual meetings, 1956-1971; minutes and correspondence of the Board of Governors and its Executive Committee, 1953-1972; files on budgets and staffing, 1962-1973; and documents on the merger with the Conseil de Développement Social. The operations of standing committees (Committee on Committees, Admissions and Standards, Nominating, etc) are documented by broken series of minutes from 1937 to 1971. Far more extensive are the papers of special committees researching social problems such as school leaving, 1934; single parents, 1949; housing and urban renewal, 1967-1971; dental services for children, 1950-1961; and low-cost medication, 1970-1971. These files include case work studies, correspondence, minutes and reports. The question of day care is particularly well covered, both through committee materials and through the files of Barbara Heppner, MCSA Day Care Coordinator, 1969-70. Correspondence files contain letters and reports from member agencies, university schools of social work, co-ordinating bodies such as the Canadian Welfare Council and the Conseil de Bien-Etre du Québec, various citizen's groups, and government bodies. A large percentage of this material consists of information files, containing reports of, and studies by, American and Canadian social agencies, conference and workshop proceedings, and materials on social legislation.

The fonds consists of the records of the Zoological Society of Montreal for the entirety of its existence, from 1964-2016. These records were generated in the pursuit of the Zoological Society’s goal to enhance public awareness of wildlife conservation issues through speakers, film screenings, field trips, special events, and large projects. The records also reflect the Society's charity to zoological, ecological and conservation causes. The administration of the Society, its interactions with its members, and its projects and events are documented through minutes, correspondence, communications, published articles, financial documents, reports, and proposals. The Society’s interests and activities are also reflected through books, objects from their offices, audio and video materials, and 5243 photographs, most of which are stored in photo albums. The fonds also contains the records of the Zoological Society of Canada, which were created to administer the Canadian Society similarly to the Montreal Society, with the goal of expanding the organization’s reach nationally.

The fonds is comprised of the following series: 1) Activities (1965-2013); 2) Administration (1964-2016); 3) Artifacts (1980-2004); 4) Books (1967-1991); and 5) Newsletters (1967-2016).

Frobisher's papers comprise a letterbook of the North-West Co. containing copies of letters written by Frobisher from April 1787 to October 1788, two original letters to Simon McTavish, 1796, and one from him, 1787, business and legal documents, largely concerning the estate of James McGill, 1810-1834, and a diary, 1806-1810, mostly a record of where he dined.