Series Genealogical Materials contains hand-written genealogies, family histories, newspapers, newspaper clippings, and miscellaneous writings.

Series Legal, Business, and Financial Documents contains receipts, invoices, legal summons and results, bank statements, insurance accounts, and other such documents as well as 7 architectural/technical drawings and 1 photograph.

Legal series is comprised of legal correspondence, real estate records, assurance policy certificates, and contracts

This series contains working papers, notes, drafts, articles, and ephemera compiled by Cushing during the preparation of his biography of Sir William Osler. The material is arranged alphabetically generally by topic or author. There are also two files of Cushing's correspondence related to the publication of the biography.

The photographs in the Nobbs archive document some of his architectural projects including urban domestic architecture, renovations to the interior of Christ Church Cathedral in Montreal, McGill's MacDonald Engineering Building, a proposal for Winnipeg City Hall and a proposal for a war memorial at Lille in France. Documented are plans, exteriors and interiors, models, buildings under construction and perspectives. Included are five photograph albums.

The substantial catalogues series covers most of the inventory of both the Society’s museum and library. Museum catalogues provide detailed information regarding the genus, species and origin of their Mammalia Collection while catalogues of donations to the museum also point to interesting objects in their collection. Library catalogues list publications in the Society’s holdings. The series also provides important lists related to the Journals of Assembly and to the visitors of the museum.

This series contains of Cushing's typewritten drafts of chapters from his book, The Life of Sir William Osler. The series is arranged into files corresponding to chapter divisions.

The series consists of chiefly of letters written by Osler that Cushing collecting during the preparation of his biography, The Life of Sir William Osler, between the years of 1920 and 1924. The letters in the series include both originals and transcriptions. The series also contains accompanying notes (both by Cushing and by Osler), clippings, articles, and other ephemera related to Osler.

The minutes series comprises eight bound volumes, two publications and one envelope of loose duplicate minutes. The minutes document proceedings from the annual, general, monthly, special, ordinary and extraordinary meetings held by the Society. It consists of the minutes from the Natural History Society (1827-1923), the Natural History Society Council (1827-1922), and the Natural History Society Committees (1906-1908).

The handwritten and typed minutes document the Society’s activities, including lists of members, newspaper articles, donations to the Society, elections, advertisements for sponsored lectures, and reports from committees. Handwritten copies of letters from Dr. Meade, Mr. C.U. Shepard, Major Delafield (File 5.2) and Robert Burn (File 9.1) to the Society as well as letters sent on behalf of the Society (Smithsonian Institute, File 5.1) are included with the minutes.