Columbia subject headings:
Authors, Irish--20th century--Biography.
Ireland--History--20th century.
Ireland--Politics and government--20th century.
Yeats, W. B. (William Butler), 1865-1939.
Harvard subject headings:
Authors, Irish--20th century--Biography
Ireland--In literature.
Ireland--Politics and government--20th century.
Yeats, W. B. (William Butler), 1865-1939--Political and social views.
Princeton subject headings:
Authors, Irish--20th century--Biography.
Ireland--In literature.
Ireland--Politics and government--20th century.
Yeats, W. B. (William Butler), 1865-1939--Political and social views.