Fonds consists of sheet music, some of which is hand-copied. The items originated with Captain Charles Rubidge and penciled annotations suggest that he collected or hand-copied a number of them in the early 1800s for his wife-to-be, Margaret Clarke, before coming to Canada. "Mrs. Rubidge" is written in hand on some pieces. Provenance is indicated on some documents in layered notes made by family descendants across generations. Also included is information compiled by Laurie Lambe Wallace about the sheet music and its history within the Rubidge family.

In 2017, 29 additional pieces of sheet music dating to the early 1800s were added. This music belonged to Mary Catharine Dunsford, wife of Reverend Hartley. Some of the music includes handwritten notations with family names and dates. While the publications of some pieces may date to the early 1800s, the handwritten penciled dates cover a period generally between the 1830s and 1860s. The notations point to connections between the Rubidge, Dunsford, McEwen, and Boyd families of the Peterborough area. Included in this addition is genealogical information compiled by the donor.

This fonds consists of various original and copied records of the business activities of Thomas Hay, and related family data, such as birth-death records, correspondence, drawings (technical and sketches) and photographs. A small genealogical table compiled by the archivist is enclosed.

This addition to the fonds consists of records created by Frank Morris. The fonds is arranged into the following series: correspondence, manuscripts and typescripts; postcards of the British Isles and Canada; photographs and negatives of botanical species from field trips; glass lantern slides of flowers, fine arts, museums, and scenes of Europe; and maps, mostly of Great Britain and Ontario.

This addition to the fonds consists of articles and booklets written by Frank Morris; manuscripts and published articles by Douglas Sadler; correspondence, minutes of meetings relating to Sadler's involvment in environmental and naturalist issues and activities; correspondence relating to Teacher's College and several issues of the Young Naturalist.

This fonds consists of minutes, financial records, scrapbooks and other records relating to the Lyceum Club and Women's Art Association of Peterborough. The scrapbooks contain articles on the clubs history as well as photographs and other notes of interest.

Fonds consists of Professor Joseph Wearing's research materials, newspaper clippings, reports, and articles related to the Liberal Party of Canada, various Liberal Party conventions and conferences, the Peterborough Riding Liberal Association, the Progressive Conservative Party of Canada, government and Canadian federal cultural policy, Canadian federal elections of the 1960s and 1970s, and The Arts. Also included are miscellaneous notes and manuscripts, as well as materials related to the video “:30 Second Democracy” and Wearing’s book, The L-Shaped Party: the Liberal Party of Canada, 1958-1980. Included also in this fonds are programs, financial and administrative records, and minutes related to Peterborough Symphony Orchestra, 1970s-1980.

Fonds consists of two boxes of materials related to the life of Spencer J. Harrison, artist and gay activist.

This addition to the fonds consists of annual reports, programmes, constitution, minutes and accounts relating to the Lyceum Club and Women's Art Association of Peterborough. Some of the records pertain to the Drama Study Group.

This fonds consists of correspondence, radio scripts for the Canadian Broadcasting Corporation, book reviews and other written records by Fern Rahmel.

The fonds consists of the constitution and by-laws of the Peterborough Community Concert Association. Also included are correspondence, contracts, minutes, programmes, clippings and publicity materials of each concert season spanning a twenty-nine year period.

This fonds consists of newspaper clippings and magazine articles by and about Robertson Davies (including a newspaper clipping of his obituary); Fern Rahmel's articles "Robertson Davies: Wonder-Worker" and "Robertson Davies: "Teacher"-Director"; the stage manager's copy of Robertson Davies' play King Phoenix staged at Peterborough Little Theatre; correspondence between Robertson Davies and Fern Rahmel; and a photo of Brenda Davies and Robertson Davies.

This fonds consists of various scripts and manuscripts, films, audio cassettes, etc., and related correspondence. Also included are photographs and personal correspondence.

This fonds consists of programmes, rules and regulations, membership records, annual reports, minutes, photographs, correspondence and research material of the Lyceum Club and Women's Art Association of Peterborough.

This collection consists of theatre programs and tickets primarily of the Peterborough Theatre Guild (1967-1990) plus a variety of programs of other Peterborough-based theatre clubs and organizations such as Arbor Theatre, PCVS Senior Dramatic Club, Peterborough Arts festival, Kawartha Summer Theatre, Arbor Productions, Arbor Theatre, Canadian Images, Mackenzie Gallery, Peterborough District Guild of Arts & Crafts, Peterborough Symphony Orchestra, National Ballet of Canada, and St. James Players.

This fonds consists of minutes, programs and membership lists of the Shakespeare Club which was a Peterborough women's club.

This fonds consists of programmes, annual reports, a memorial certificate for the 90th anniversary of the Lyceum Club and signed by Peter Adams, photos of club events and award winners, etc., administrative papers, a scrapbook, and Rug Group log books.

This fonds consists of 4 boxes of materials related to the life and works of Spencer J. Harrison.

This fonds consists of correspondence with Board of Governors of Trent University and other Trent records. It also contains research records for book a by Professor Denis Smith: Bleeding Hearts, Bleeding Country and records relating to his editorialship of "Canadian Forum".

This fonds consists of photographs, programmes of concerts, as well as financial statements, budgets, etc. There are also newspaper reviews and adds for the concerts, administrative papers, minutes of meetings, lists of board and executive members, contracts, and campaign reports.

This fonds consists of copies of papers written by J.E.R. and H.V. Munro of Peterborough, Ontario, on the following topics: The Shanleys - Pioneer Railway Builders, manuscript 14 pages, (London, Ontario); Katherine Wallis - 1945 address to Women's Art Association of Peterborough, manuscript, 9 pages; Women's Art Association of Peterborough through 60 years, 1965, 8 pages; Pioneer; A Chronology of Prince Edward County and the Early Pioneers, 1964, 28 pages; and The Village of Demorestville in the Township of Sophiasburg in the County of Prince Edward, Ontario, 1971, 23 pages and 6 pages correspondence from 1972.

This fonds consists of materials relating to Gilbert and Sullivan productions, the Coventry Singers of Peterborough, and the Town and Gown concerts of Peterborough. Also included are materials related to the Progressive Conservatives, the New Democratic Party, the 1975 election, and Peterborough voting patterns.

This fonds consists of Town & Gown Concerts programmes, correspondence, minutes, newspaper clippings, press releases, and financial statements, 1969-1979. Also included are miscellaneous programmes of Trent University Performing Arts Series, Trent Music Hall Society, Theatre Trent, Peterborough Festival of the Arts, Community Concert Association, and Peterborough Symphony Orchestra, 1970-1987.

This fonds consists of programmes, rules and regulations, membership records, annual reports, minutes, correspondence and research material of the Lyceum Club and Women's Art Association of Peterborough.

This fonds consists of Peterborough Community Concert Association administrative and promotional material, correspondence, meeting agendas and minutes, budget reports, series programs, newspaper clippings, membership lists, newsletters, artist contracts, and other related material.