O'Brien, A. P. (1921). Two bound diaries for 1921 and 1922, copperplate used as a header for the "Delegation of the Elected Government of the Republic of Ireland, 3 Adam Street, London W.C", and two photographs of a writ of summons for Art O'Brien in the O'Brien versus Michael Collins trial.

O'Brien, Art Patrick. Two Bound Diaries for 1921 and 1922, Copperplate Used as a Header for the "Delegation of the Elected Government of the Republic of Ireland, 3 Adam Street, London W.C", and Two Photographs of a Writ of Summons for Art O'Brien in the O'Brien Versus Michael Collins Trial. 1921.