O'Callaghan, D., & Dutton, C. B. (1923). Copies of memorandums between Dónal O'Callaghan and C.B. Dutton concerning the appointment of Brian Hannigan as Irish represntative in England, the account of the London Office, and the factionalism developing between the Irish Self-Determination League of Great Britain and the Irish Freedom League in London.

O'Callaghan, Donal, and Charles Bertram Dutton. Copies of Memorandums Between Dónal O'Callaghan and C.B. Dutton Concerning the Appointment of Brian Hannigan as Irish Represntative in England, the Account of the London Office, and the Factionalism Developing Between the Irish Self-Determination League of Great Britain and the Irish Freedom League in London. 1923.