Minister for Education in the Second Dáil (1922), Ceann Comhairle (1922–32): Dáil Éireann standing orders, circulars, agendas, departmental and ministerial reports; material relating to the Treaty Debates and attempts to prevent a split in Dáil Éireann and the Army; correspondence concerning the position of National University of Ireland T.D.s on the Treaty; copies of speeches as Minister for Education; correspondence with universities and schools and memoranda on matters such as finance, curricula, qualifications, and the availability of teachers; correspondence concerning the position of teachers in Northern Ireland; correspondence as Ceann Comhairle with the President of the Executive Council and the Chairman of the Seanad on Oireachtas procedural and staff matters; memoranda on the offices of Governor General, President of the Executive Council, Ceann Comhairle and Leas Ceann Comhairle; reports on the Irish Race Congress, Paris (1922); correspondence concerning the refund of deposits for the 1918–23 general elections; requests for interviews and references.

Ballykinlar No 2 Internment Camp (1921): correspondence and reports concerning educational activities in the camp; correspondence with family and friends while interned and other internees after his release; draft chapters of a book describing conditions and activities in the camp.

Northern Ireland (1921–2): memoranda, reports, statements, statutory declarations, correspondence and news cuttings relating to events in Northern Ireland with particular reference to sectarian murder, arson and bomb outrages; the activities of the British Army and Ulster Special Constabulary; the implementation of the second Craig-Collins Pact; and distorted reportage and censorship of news in Northern Ireland newspapers.

Correspondence concerning the administration of the estate of the late President Arthur Griffith and the proposed President Griffith Bill; correspondence with Sean Milroy and Padraic Colum concerning the commissioning and progress of a biography of Griffith; correspondence with contemporaries of Griffith concerning aspects of his life; notes, drafts and copy chapters of the biography.

Draft chapters of a proposed book on the period 1919–23, together with related correspondence with publishers (1950s–70s); copies of articles and speeches on political, economic, historical and cultural topics.

Cumann Na nGaedheal and Fine Gael (1925–66): party political material including policy documents, newspapers and periodicals, and election posters.

News cuttings consisting mainly of retrospective comment and analysis of the 1916 Rising, the War of Independence, the First Dáil and the Civil War; copies of letters to the editors of Irish newspapers mainly on political matters(1922–72).