In September of 1966 several former students and teachers held a meeting to discuss plans for a grand reunion of all students and teachers to be held in 1967 before the building was demolished. Early in 1967, a commemorative coin was commissioned to celebrate the event as well as raise additional funds for the reunion. The reunion was held on August 4-7, 1967.
The fonds consists of photographs and correspondence, publicity materials, a commemorative coin and its casting, and a rubber stamp.
The fonds is organized into the following series:

1. Photographs and correspondence, 1966-1968
2. Publicity, 1967
   This fonds would be of interest to researchers studying the architecture of old schools, the actual reunion of St. Thomas Collegiate Institute in 1967, and the lives of students and former teachers that were associated with this school. The pictures provide a pictorial of what times were like for the school over the years and also the attendees at the reunion.

The fonds consists of various records created, collected and maintained by the Order of the Eastern Star, Flower City Chapter No. 91 (St. Thomas, Ont.) 1919-2004.
The fonds is arranged into the following series:

1. Membership and attendance, 1922-2009
2. By-laws, 1926-2009
3. D.L. Club series, 1939-1979
4. Financial records, 1948-2009
5. Minutes series, 1968-2009

This series is comprised of the Charter, by-laws and minutes of the Quota Club of St. Thomas.

This series is comprised of Treasurer's Reports and financial reports for membership fees and special events.

This series is comprised of the financial records of the Kiwanis Club of St. Thomas. Includes the following:
-Correspondence and records realting to bequests.
-Financial Statements
-Budgets
-Annual Returns
-Charitable organization filing
-Balance Sheets & Income Statements

This fonds consists of records created or maintained by the Crothers and Price, Barristers, law firm of St. Thomas. Fonds has been divided into the following series:
-Cash Books series, January 14, 1897-July 30, 1914.
-Miscellaneous financial records series, 1899-1913.
-Day Book series, October 19, 1908- August 22, 1914.
-Receipts and Disbursements ledger series, 1909-1914.

This fonds comprises records created and/or maintained by Garnet Trevithick during his time as teacher and principal at St. Thomas Collegiate Institute, and during his personal life. Fonds is divided into the following series:
-Personal records series, 1919-1993.
-Photographs series, ca. 1932-1989.
-General History series, 1965-1988.
-Publications series, 1991.

This series contains those minutes, reports, financial records, and correspondence retained by Archibald McLachlin pertaining to Alma College. Records include letters from visitors, solicitations, meeting minutes, an annual report, tuition statements, and lists of boarders.

The City of St. Thomas Engineering Department fonds consists primarily of photographs, both black and white and in colour, documenting structural defects in sidewalks and sewers, repairs, road widenings and other projects, alongside general documentation of roads, sewers, and buildings in St. Thomas, primarily from the 1940s through the 1970s.

This fonds consists of three series:

1. Events: Documentation, including reports, clippings, and photographs, surrounding large or notable events in which the City Engineer or Engineering Department was involved.
2. Photographs: Photographs documenting paving issues, sewer or maintenance work, or other projects done by City Engineering crew, arranged alphabetically by street name. Also includes a handful of miscellaneous images, filed in original order, documenting places, events, or items, such as dog pounds or storm damage.
3. Projects: Photographs, slides, and textual documents relating to more recent projects, from the 1970s up until 1998, often documenting the different stages of a large-scale project.

The Projects series consists of slides, photographs, negatives, and other material documenting specific improvement projects undertaken by the City.

Fonds contains letters, notes and other documents collected by William Murch in his personal life and career as a bookseller and is arranged into the following series:
-Personal Records series
-Business Records series
-Publications series

This series contains publications collected by William Murch, including:

• Summer Resorts: Tourists Routes and Rates by the Grand Trunk Railway.
• Tourist's Guide: Lehigh Valley and Erie Railways to Summer Resorts, 1876.
• The Canadian Methodist Quarterly, January 1889.

The fonds contains records created by the Kettle Valley Pioneers, largely reflecting the planning process of the annual Elgin Historical Show. Includes meeting minutes and attendance records from the Kettle Valley Pioneers. The fonds also contains correspondence, bulletins published by the Kettle Valley Pioneers, publicity and advertising materials, and scrapbooks. The fonds is arranged into the following series:
-Scrapbooks series, 1970-2005.
-Elgin Historical Show Materials series, 1979-1988.
-Administrative Records series, 1979-1989.
-Correspondence series, 1979-1991.
-Newsletters series, 1982-1996.
-Minutes series, 1979-2010.
-Attendance records series, 1984-2001.
-1985 IPM series, 1985.
-Publicity and Advertising series, 1991-1998.

Series contains copies of the official newsletter published by the Kettle Valley Pioneers that reports important updates for the club and Elgin Historical Show. The bulletin was originally titled “Kettle Creek Bulletin”. The title was changed to “Kettle Valley News” in January, 1993.

Series contains bound final reports for the 1985 International Plowing Match which was held in Elgin County and includes reports from various committees as well as statements of receipts and expenditures. Series also contains loose papers including correspondence, a budget, site map, and copies of a report produced by Don Williams that was submitted to the final report. Includes an annotated photocopy of participants contributing to the Antique and Historical section of the plowing match.

Collection contains material collected, created or maintained by Shirley Ewanick, mostly regarding the history of cemeteries in Elgin County. Also contains research material relating to the history of street names in St. Thomas.

This file contains the following records:
-By-laws of the West St. Thomas District No.9, July 9, 1938 (2 copies).
-Correspondence from the Rebekah Assembly of Ontario, I.O.O.F., to ina Ross of Shedden, regarding the by-laws of the St. Thomas West District #9, July 4, 1944.
-By-laws of the West St. Thomas District No. 18, November 18, 1954 (2 copies).
-Amendments to the By-laws of the West St. Thomas District No. 18, June 22, 1983 (2 copies).

Fonds consists of 36 photographs collected by Bruce Marshall. Many of the photographs are of minor hockey teams, many of which were connected to St. Thomas, Ontario.

Series consists of membership lists, applications and other documents relating to the membership of the St. Thomas branch of the Canadian Federation of University Women.

This series contains minute books with relevant newspaper clippings, newspaper advertisements and concert programs pasted to the pages. This series is comprised of the following;
-Minute book of the Evening Music Club with member attendance, 1921-27.
-Minute book of the Evening Music Club, 1931-37.
-Minute book of the Evening Music Club, 1938-1939.
-Minute book of the Evening Music Club, 1949-1950.
-‘Record’ Minute book of the Evening Music Club, 1960-1969.