Selected papers of the Hart Family include a diary kept by Bernard Samuel Judah (an in-law of the Harts) during a voyage to the United States to visit his son Samuel, 1827-1828; a Jewish calendar belonging to Alan Judah Hart with notices of family births and deaths, 1903-1930, and few diary entries, 1917-1919; a few items of correspondence of Alan Hart and his family relating to family history, 1923-1972; some notes on family history, and 25 portraits (photographs, silhouettes) of family members from 1823 to ca 1960.

The fonds contains original and typescript letters, manuscript notes, newspaper clippings, journal extracts, reminiscences and more, assembled by Harvey Cushing chiefly between 1920 and 1924 during the course of his research for the biography of William Osler. For the biography, Cushing collected and retyped over 7500 pieces of Osler's correspondence, among which are some original letters.

The fonds is separated into three series: Manuscripts, Working Notes and Osler's Correspondence. It also contains photographs, annual reports, publications, clippings, one watercolor painting, one postcard. Osler's correspondence is further arranged in three subseries based chronologically.

The Hellmuth Wolff Organ Collection consists primarily of organ plans, pamphlets, photographs, books and periodicals, and personal correspondence. The majority of these documents are associated with or represent one of the fifty organs in Wolff’s opus. In addition to depicting Wolff’s instruments, the collection of organ plans also includes Wolff’s drawings for proposed but not-constructed organs, plans by other organ builders, and plans drawn by Wolff that are based on historical models and treatises by writers such as Dom Bédos. Of the photographs, most are associated with specific Wolff organ projects and represent a span date of the late 1960s to the early 2000s. Also in the photograph collection are images of historical organs in Europe, which Wolff presumably used in modelling and designing several of his instruments, as well as images associated with other organ projects by builders such as Casavant Frères, Karl Wilhelm, and Rieger, all of whom Wolff worked with before establishing his own workshop in Laval. The collection of pamphlets includes programs, program notes, and concert series information for several of the Recitals and concerts performed on Wolff’s instruments. Of the periodicals and books, titles include The American Organist, Choir & Organ, and Orgelforum. Also in the collection are several three-dimensional models, or maquettes, of Wolff organs.

Mintzberg's papers comprise student materials, office files, and papers relating to his publications. Student materials contain course notes from both the engineering (1956-1961) and management (1961-1968) phases of Mintzberg's education, as well as research notes and drafts for his doctoral thesis "The Manager at Work". His McGill office files contain reports, minutes and memoranda for various faculty committees (1968-1976); correspondence, particularly regarding the M.B.A. programme (1970-1976); course outlines (1968-1973); and files on his Ph.D. students (1974-1976) (Restricted). Papers relating to publications include research notes, working papers, and drafts of articles and books, as well as correspondence about his writings (1968-1978).

This collection reflects Henry S. Chapman's relationships with a number of important figures in Montreal's political and business history, between roughly 1833 and 1853, the period following Chapman's return to London. A significant amount of the material in this collection is related to the 1837-1838 Upper and Lower Canada Rebellions (especially in Montreal), as well as events occurring immediately after the uprisings.

Consists of copies of original material, chiefly correspondence, arranged roughly by date. The contents of letters (1835-1853) include business partnerships, political reform, and personal news. Significant correspondents include Louis-Joseph Papineau, Louis-Hippolyte La Fontaine, Jacob Dewitt, François-Antoine Larocque (of Laroque and Bernard), Joseph Perreault, and Edmund Bailey O’Callaghan. There is also a partial manuscript on Canadian history and pages from a scrapbook, both dating from the 1830s.

Fonds documents the Montreal years of H.V. Ogden and the ties he had with Sir William Osler. The fonds contains the correspondence of H.V. Ogden consisting of letters from May Francis and Marian Francis (Osborne), letters from George Cantlie, a letter from Dr. Robert Palmer Howard and a letter from Edmund J.A. Rogers.

The papers of "Jackrabbit" Johannsen reflect his personal, professional and recreational activities, mainly between 1934 and 1985. The largest part of the papers consists of correspondence with friends and organizations, particularly relating to skiing and outdoor life. Family relations are also covered. A series of brief journals provides a record of some of his daily activities, from 1948 to 1984. The remainder of the fonds include publications about Johannsen, photographs, maps and personal documents such as passports.

Fonds consists of records (originals, printed materials, photographs and motion pictures) that are almost entirely of a professional and research nature, covering Barnes’ general scientific and university work during World War I, a number of special research problems, and his involvement in scientific and social organizations.

His general scientific and university files (1914-1915) contain correspondence, including copies of some of Barnes' outgoing letters on departmental adminstration, Barnes' lectures, publications, scientific apparatus, research problems and the exchange of information. Correspondents include colleagues in other institutions (including Ernest Rutherford), learned societies, and private industry. This series also contains a file on purchases for the University Library, and inventories of Barnes' library.

Far more extensive are the materials on special research problems. These comprise notes, essays and correspondence on the detection of submarines (1915-1917) and on the development of anti-freezing devices for fire extinguisher and sprinkler systems (1917). A report by Barnes on the effect of ice conditions on St. Lawrence navigaton is supplemented by printed background materials and copies, or extracts from other reports. Barnes' work on icebergs is documented by five binders of clippings, photographs, maps and diary notes on research expeditions to Newfoundland (1924-1929). Practical experiments in ice clearance are illustrated by bound notebooks of clippings and photographs, as well as a number of loose photographs showing ice and flooding damage, use of thermite and calcium chloride, apparatus and ice-crushers (ca 1921- 1929). Finally, two reels of 35 mm motion picture film (ca 1930) show Barnes experimenting with a new mercury microthermometer.

Barnes' work as Hon. Secretary of the Canadian Committee of the British Science Guild is documented by correspondence from 1907 to 1919, largely concerning the recruitment of members and officers, but also touching on a survey of science teaching in schools and the Panama-Pacific Exposition of 1917. Less extensive files cover Barnes' involvement in the International Council for the Exploration of the Sea (1912-1914), the Rotary Club (1917) and the McGill Graduates' Society (1919)

Wallis' papers are grouped into three series: general scrapbooks, military scrapbooks, and military diaries. General scrapbooks, covering the years 1908-1977, contain letters, photographs, and printed materials relative to Wallis' career. Some volumes include his diary for the period, and all are heavily annotated. They cover all aspects of his career from high school to post-retirement, with special emphasis on his military career and social life. Military scrapbooks contain the same variety of materials for the period 1911-1969, but are devoted exclusively to Wallis' activities during the two World Wars, and his roles in the Black Watch and as an Honorary A.D.C. Military journals give brief reports of his daily activities form 1941 to 1945.