Columbia subject headings:
Celts in literature.
Celts--Ireland--Folklore.
Folklore in literature.
Folklore--Ireland.
Folklore.
Yeats, W. B. (William Butler), 1865-1939--Dramatic works.
Yeats, W. B. (William Butler), 1865-1939--Knowledge and learning.
Harvard subject headings:
Celts in literature.
Celts--Ireland--Folklore.
Folklore in literature.
Folklore--Ireland
Ireland--In literature.
Literature and folklore--Ireland--History--19th century.
Literature and folklore--Ireland.
Verse drama, English--Irish authors--History and criticism.
Yeats, W. B. (William Butler), 1865-1939--Dramatic works.
Yeats, W. B. (William Butler), 1865-1939--Knowledge--Folklore.
Princeton subject headings:
Celts in literature.
Celts--Ireland--Folklore.
Folklore in literature.
Folklore--Ireland.
Yeats, W. B. (William Butler), 1865-1939--Dramatic works.
Yeats, W. B. (William Butler), 1865-1939--Knowledge--Folklore, mythology.