Columbia subject headings:
History in literature.
History.
Ireland--In literature.
Yeats, W. B. (William Butler), 1865-1939--Knowledge and learning.
Harvard subject headings:
History in literature.
Ireland--In literature.
Yeats, W. B. (William Butler), 1865-1939--Knowledge--History.
Princeton subject headings:
History in literature.
Ireland--In literature.
Yeats, W. B. (William Butler), 1865-1939--Knowledge--History.