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Dutton, Charles Bertram, et al. Correspondence Between C. B. Dutton, Art Ó Briain and Domhnall Ó Ceallacháin, Minister for Foreign Affairs, with Copy Letter to Seán T. Ó Ceallaigh from Ó Briain, Written While Still in Prison and a Statement of London Office’s Account Completed by Dutton. 1923.