This fonds consists of microfiche copies of manuscript diaries written by King covering his university education, entry into the civil service, achievements as Minister of Labour and his election in 1919 as Leader of the Liberal Party, the Liberal victory of 1921 and the King-Byng controversy. The manuscripts are contained in consecutively numbered fiches. Typewritten transcripts of the diaries are included in a second series of microfiches. Also included are various private typewritten diaries relating to international relations and industrial relations. An index accompanies the microfiches. The records in this fonds range from 1893 to 1931.

This addition to the fonds consists of microfiches of manuscript and typescript diaries and microfiches of typed transcriptions of diaries of William Lyon Mackenzie King dated from 1932 to 1949. These are additions to microfiches purchased in 1975.

The Finding aids are on microfiche to selective holdings in the Public Archives of Canada (now the Library and Archives Canada).

The microfiches consists of the catalogue of municipal records and manuscripts in the D.B. Weldon library at the University of Western Ontario.

This fonds consists of a microfilm series known as "Black Series" headquarters files from 1872 to 1950.

The microfiches contain the guide to the holdings of the Archives of Ontario for the Jarvis-Powell Papers, the Strachan Papers, the Sir Alexander Campbell Papers and the Ontario Commissions and Committees.

This index consists of computer output microfiches of land records held in Archives of Ontario. The microfiches provide an index to Crown Land Papers, Canada Company Papers, and the Peter Robinson Papers from 1819 to 1830.