The Aylmer Centennial Garden and Horticultural Society fonds consists of 3 scrapbooks, and associated negatives, encompassing the years 1972-1997, that document the Society's meetings, activities, events, and members.

Fonds consists of various records relating to the publication "Birds of Elgin County" (2004), including research materials, project proposal/ prospectus, correspondence and financial data, promotional materials and reviews, and two copies of the book - one unsigned softcover copy of the first printing, and one hardcover copy of the first printing signed by most but not all book contributors and members of the project coordinating committee.

Fonds consists of an accounts ledger of the Springfield Horticultural Society.

Fonds consists of administrative, public outreach, field notes and memorabilia records and photographs related to the activities and events of the St. Thomas Field Naturalist Club and its predecessor, the Elgin Nature Club. Included are: minutes, annual reports, programmes, newsletters, field observation notes, bird censuses, scrapbooks and photographs. Fonds is comprised of the following series:
-Publications, 1939-2004
-Minutes, 1941-1992
-Events, 1941-2000
-Correspondence, 1946-2004
-Newspaper clippings, 1950-2010
-Membership and Attendance, 1952-ca.2000
-Annual Reports, 1953-2009
-Constitution and By-laws, 1956-1993
-Treasurer's, 1958-1999
-Hawk Cliff Wildlife Area, 1968-2003
-Accessions, 1980-ca. 2000

Fonds consists of records created and maintained by William G. (Bill) and Eileene Stewart during their personal and professional life, but primarily relating to their efforts in studying and documenting the natural history of Elgin County.
Comprised of the following series:
-Personal records series, 1955-1998
-Natural history publications series, 1958-ca. 1997
-William G. Stewart research notes series, 1975-1976
-William G. Stewart publications series, 1978-1999
-Publications series, 1985-2002
-Eileene Stewart publications series, 2000-2003