Typescript of letter relating to political affairs, a duel and court cases in the York (Toronto) area, with comments on the imminent war with the United States (War of 1812-14). Original at the Ontario Provincial Archives.
Holograph letter dated July 25, 1840 donating first books to Queen's College Library, typescripts of letters, 1807 and 1840. Transcript of article published in London Free Press, 29 Oct. 1948 describing Mitchell's life and career.
Fragment of letter to the Duke of York from Wellesley prior to his appointment as Duke of Wellington. The letter pertains to an appointment in favour of Captain Campbell.
Order from S.S. Johnston, Colonel of Militia, regarding the assemblage of a Battallion (Addington Militia) on September 13th, 1806 at the house of John Davey. Directions are given as to the procedure of assembly with regards to the appropriate age of individuals to be included.