O'Brien, A. P., & De Valera, É. (1922). Correspondence between Art O'Brien and Éamon De Valera mainly relating to the official work of the Republican government, including letters regarding propaganda, Irish envoys in Europe, American funding, financial assistance for Edward Boland, and Document No. 2. Also includes a letter of resignation from O'Brien.

O'Brien, Art Patrick, and Éamon De Valera. Correspondence Between Art O'Brien and Éamon De Valera Mainly Relating to the Official Work of the Republican Government, Including Letters Regarding Propaganda, Irish Envoys in Europe, American Funding, Financial Assistance for Edward Boland, and Document No. 2. Also Includes a Letter of Resignation from O'Brien. 1922.