The fonds consists of concert and theatre programs from Millbrook, Ontario; World War I materials including prisoner-of-war post cards, and photographs; and theatre programs, menus and other material relating to entertainments which allied prisoners in German war camps devised for their own amusement and which were collected by Lieutenant W.E. Massey-Cooke.

This fonds is a small collection of historical information on the people, places, mills, organizations in Cavan Township and the Village of Millbrook. Included are reminiscences from pioneer descendants, essays on the Cavan Blazers (an Orange vigilante group), early mills, prominent pioneer citizens and local legends.