Columbia subject headings:
Ireland--Politics and government--1910-1921.
Ireland--Politics and government--1922-1949.
Harvard subject headings:
Ireland--Politics and government--1910-1921.
Ireland--Politics and government--1922-1949.
Ireland--Politics and government--20th century.
Princeton subject headings:
Ireland--Politics and government--1910-1921.
Ireland--Politics and government--1922-1949.