Columbia subject headings:
Harvard subject headings:
English literature--European influences--Congresses.
Europe--In literature--Congresses.
Yeats, W. B. (William Butler), 1865-1939--Knowledge--Europe--Congresses.
Yeats, W. B. (William Butler), 1865-1939--Knowledge--Literature--Congresses.
Princeton subject headings:
English literature--European influences--Congresses.
Europe--In literature--Congresses.
Yeats, W. B. (William Butler), 1865-1939--Knowledge--Europe--Congresses.