Columbia subject headings:
Yeats, W. B. (William Butler), 1865-1939--Dramatic works.
Harvard subject headings:
Ireland--In literature.
Yeats, W. B. (William Butler), 1865-1939
Yeats, W. B. (William Butler), 1865-1939--Dramatic works.
Princeton subject headings:
Yeats, W. B. (William Butler), 1865-1939--Dramatic works.