The fonds consists of records related to the history and activities of the Brownsville Optimist Club formerly located in Brownsville, Ontario. They are arranged into the following series and subseries:

Series 1: Charter Banquet, 1 June 1974

Series 2: Executive Officers’ Photographs
File 1: 1974 - 1980
File 2: 1980 - 1990
File 3: 1990 - 1995

This collection consists of textbooks; correspondence; articles; pamphlets; newspaper articles; bulletins; guidebooks; booklets; registration forms; maps; master plans; inventories; indexes; publications; slides; reports; conference and symposium programmes; speaker biographies; mailing lists; business cards; hand-written notes; photocopied articles and appendices; presentations; and reference lists created by Canadian conference organizers and their participants with a focus on horticulture, landscape, garden history, and historical farms and museums.

The records contain the following series; Secretaries' and Treasurers' Records 1862-2016;
Awards, Newspaper Clippings

Collection consists of memorabilia and material pertaining primarily to the activities of the Whitby Dunlops during the team's active years from 1957 to 1959. There is also material which relates to anniversaries and other events in the years following the team's dissolution in 1960. Collection is comprised of 8 series including: Programs, Publications, Ephemera and artifacts, Team information, Events, Diary of Kay Irwin, Postcards and photographs, and Video.