Fonds consists of correspondence and literary manuscripts, documenting all aspects of MacMillan’s career. Biographical background is provided by his own notes on his life and family history. From his student years come certificates and testimonials in support of his application for a Rhodes Scholarship (1904-1909). His war experience is recorded in letters from the front preserved by his family, and by a personal diary for 1917. There are also approximately twenty photographs of Macmillan and his family taken between about 1905 and 1940.

Macmillan's correspondence includes files of letters to his wife (1917-1936) on his war service and political affairs; personal and social letters (1923-1929); political correspondence, including several letters from McKenzie King (1926-1946); letters concerning McGill, including a number from Sir Arthur Currie and from Stephen Leacock (1920-1947); post-retirement correspondence on McGill and public affairs; and correspondence concerning his publications (1920-1960). There are also files of invitations to events at McGill and elsewhere.

The manuscripts fall into two categories: political speeches and literary manuscripts. Besides notes and texts for his own speeches, there are also texts of, and newspaper clippings about speeches written by Macmillan for Sir Arthur Currie and others (1920-1950). Drafts and typescripts of his literary works are supplemented by notes, clippings and correspondence.

The fonds consists of material related to Donald J. Beauprie's life as a student and alumnus of McGill's Faculty of Dentistry. The records include receipts, correspondence and newspaper clippings related to dentistry (1954-1957); McGill memorabilia and ephemera; correspondence; articles and publications (issues of McGill Daily, Dawson Weekly, McGill News, McGill Dental Review); photographs; and objects (Scarlett Key Crest and Sweater, McGill University Crest, Dawson College T-Shirt, McGill Student Society Award Mug (1955-56), and a McGill Freshie button)

This collection is composed of McGill memorabilia collected by Ian C. Pilarczyk between 2000 and 2018, and includes articles, news clippings, programs (mostly football), pamphlets, photographs, objects (such as pins, buttons, medals, ribbons, humidors, spoons), addresses, medical notebooks, LPs and prints.

Fonds consists of a scrapbook largely devoted to McGill affairs. It contains correspondence addressed both to Fleet and to other members of the McGill community such as B.J. Harrington, C.H. McLeod and A.F. Gault, largely on administrative and ceremonial business of the university. There are a few communications from J.W. Dawson, including Dawson's draft for the Peter Redpath memorial tablet. Also included are newsclippings on McGill events including numerous invitations, announcements,
addresses, programs and memorabilia from convocations, university dinners, athletic meets and musical performances.

The McGill Poster Collection documents posters and ephemera announcing campus activities, primarily in the 1970s with some 1980s and 1990s material present.

The fonds consists of a Strathcona Prize Plaque from 1939 and a scrapbook compiled by Dorothy Graham McCaig during her time at McGill, 1936-1937. Notably the scrapbook includes news clippings and memorabilia of the Student Peace Protests.