Columbia subject headings:
Ireland--History--1910-1921.
Ireland--History--1922-
Ireland--History--Partition, 1921.
Harvard subject headings:
Ireland--History--1910-1921
Ireland--History--1922-
Ireland--History--Partition, 1921
Princeton subject headings:
Ireland--History--1910-1921.
Ireland--History--1922-
Ireland--History--Partition, 1921.