The collection consists of books, periodicals, and published ephemera related to alternative media between roughly the 1960s and 1998. The collections has a special focus on Quebec alternative, grassroots, and political publications as well as journalism trade publications and ephemera, and union and labour movement publications. Some publications are from Cuba and China, including Cuban calendars and some documents, books, and newspapers on China.

The collection consists of correspondence, research files, manuscripts, journals, and ephemera created and accumulated by writer and scholar Leon Edel, who was notably the editor and biographer of Henry James as well as Edmund Wilson.

Collections consists of theater, music, and dramatic productions, between 1911 and 1915, collected by T. Wesley Mills.

Collection consists chiefly of an album of photographs and clippings compiled by Cecile (Burroughs) Masson. Captions date the photographs to between 1915 and 1940, with one earlier photograph from 1883 that depicts Cecile and Rodrigue Masson's wedding. Many of the personal photographs depict members of the Masson family taken in Terrebonne, Quebec (where the Masson family home was located), in Ottawa, and during travels to Italy, London, the south of France. There are 28 leaves of full page plates of travel photographs from France, Italy, and Africa. Also included in the album are postcards and newspaper clippings. One series of postcards depicts architecture in Terrebonne, Quebec. The clippings include a letter to the editor written by L. R. Masson (Mrs. L. A. Globensky) and published in the Montreal Star, 1939. Other clippings relate to the S-Plan, a bombing campaign by the Ireland Republic Army, in 1939, as well as the British royal family. The album is half bound in faux black morocco and pebbled cloth boards with the initials C. M. stamped in gilt on the front cover. A caption at the head of the second leaf reads "This album is for mother from Grace", with "mother" crossed out. An inscription on the first leaf reads "This is for my dear daughter Cecile. Many happy memories of the past - affectionately from Mother." The collection also includes two loose black and white photograph portraits, one of which is inscribed to Aunt Cecile.

The collection comprises more than 6,000 Canadian and non-Canadian bookplates. The Masson collection reflects the range and scope of the art of bookplate design, mirroring period styles and incorporating the owners’ personal tastes and pursuits. References to heraldry, literature, nature and art are common. The collection was created by Montrealer Philippe Masson (1911-1944) and includes both personal and institutional plates. The nearly 3,000 Canadian bookplates are arranged alphabetically. The rest of the bookplate collection is divided between armorial and non-armorial plates. This unique collection represents a wide range of book ownership reflecting institutions, book sellers, and individuals as well as over one hundred examples of bookplates from Canadian libraries. The chronological coverage dates to more than a century from the early nineteenth century and continuing to the beginning of the Second World War. Bookplate design is a minor yet notable form of graphic design. Bookplates reveal a great deal about our book-centered culture. For many institutions, bookplates possess an iconographic or emblematic value reflecting the values of the institution. As well, within an institutional setting, bookplates are often used to acknowledge individual collections, gifts and bequests. Finally, for the individual the bookplate is a powerful symbol of possession and a love of books. Among the Canadian bookplates, many well-known Canadian artists are represented in the Masson collection including J. E. H. MacDonald, his son Thoreau MacDonald, Jean-Paul Lemieux, and W. F. G. Godfrey.

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 a scrapbook created by Maude Lilian Bremner during her time in South Africa as a teacher to Boer children in refugee camps, as well as other related loose clippings and ephemera. The scrapbook contains newspaper clippings, postcards, and other ephemera tipped in. Many of the clippings are articles reprinting letters written home by Bremner and other volunteer teachers in her contingent. Collection also includes a published Memorandum respecting the engagement of teachers for the refugee camps in South Africa.

The collection consists of 10 ink manuscript maps and plans on paper, some hand-coloured, depicting the earliest settlements and fortifications at Montreal and Quebec City. The earliest dated document is a plan of the fort of Quebec and is dated 1635. The earliest document in the collection depicting Montreal is believed to date back to 1642. The maps and plans were prepared by Jean Bourdon, seigneur and surveyor for the French colony. Included in the collection is a plan of the earliest Fort Richelieu of which nothing had previously been known. There are also detail drawings of riverside fortifications, probably near Montreal.

Collection contains two financial documents related to McGill College. The first is a memorandum between the College and its creditors in which the College agrees to pay out dividends and pay in installments towards the balance of the College's debt. It is signed by the individual creditors as well as by the principal of McGill College, Edmund A. Meredith. The memorandum contains a list of creditors of McGill College with their names and occupations listed, including William Lyman, druggist, Robert Abraham, printer, John Keller, merchant, and many others. A note dated 24 March 1847 with a response from representatives of the creditors is pasted on. The second document is a ledger sheet dated from 1844 to 1847 with the caption: "The Directors of McGill College to Joseph Hitchens."

Collection consists of an album of travel photographs (chiefly black and white, with some colour). Captions date the photographs to between 1946-1956 and then to between 1989-1994. The captions also include information about the photographs themselves. The first portion of the album contains photographs taken in Niagara Falls, Manitoulin Island, northern Ontario, Bermuda, the Maritime provinces, and the United States, including Howe Caverns, Fort Williams, New York, Yellowstone National Park, Plymouth Rock, Washington, New Orleans, and Mackinac Island, dated between 1946 and 1956. The second portion contains photographs dated from 1898-1994 and documents travel to Israel, Albania, the former Yugoslavia, Russia, Estonia, England, Greece, Costa Rica, Laos, Vietnam, Cambodia, and Ukraine. The album is cloth bound in blue with the title "Snaps" in black with painted tulips.