The fonds consists of records collected and created by the Assiniboine Historical Society over the course of its existence. The records include photographs and other historical documents from the Brandon area; meeting minutes; financial records; correspondence records; heritage publications; film committee and street name committee documents; a constitution; documents relating to the Manitoba Historical Society; walking tour documents; and some miscellaneous files. The documents are arranged in the following series:
Hand-coloured photographic postcard of the First Street Bridge over the Assiniboine River in Brandon, Manitoba. A man and woman are pictured fishing to the left. There is a note of correspondence written on the back of the postcard.
Hand-coloured photographic postcard of the Brandon First Street Bridge over the Assiniboine River. Two men are pictured in a canoe. Note on the back addressed to Mr. Ernie Arscott.
Hand-coloured photographic postcard of the Brandon Asylum buildings. There is a note on the back addressed to Mr. Earnie Arscott in Killarney, Manitoba.
Photograph of the office and yard of Barclay & O'Hara: Dealers in Lumber and Coal at 704 Pacific Avenue in Brandon, Manitoba. In front are people with horses and wagons. To the left is the Western Canada Loan & Savings Co. (appraiser, E. J. Barclay). To the far right is possibly the Farmers' Home Hotel.
The collection is comprised of material accumulated or created by Beecham Trotter and his family. It consists of photographs of the Trotter family and other Brandon residents. Additionally, there are drawings of different locations in the Brandon area. The collection includes a magazine article and typewritten short story written by Beecham Trotter, numerous newspaper articles he wrote on the early days of Brandon, as well as newspaper clippings pertaining to members of the Trotter family and prominent Brandon figures. Many of these are in a scrapbook, while others are separate. Items are described in detail at the individual level in the Daly House Museum database.