Columbia subject headings:
Harvard subject headings:
Catholics--Ireland--Political activity.
Catholics--Political activity--Ireland.
Home rule--Ireland.
Ireland--Politics and government.
Irish question.
Unionism (Irish politics)
Princeton subject headings:
Catholics--Ireland--History.
Catholics--Northern Ireland--History.
Christianity and politics.
Ireland--Politics and government.
Northern Ireland--Politics and government.
Ulster Unionist Party (Northern Ireland)--History.