Columbia subject headings:
Harvard subject headings:
Poetry, Modern--20th century--Study and teaching.
Yeats, W. B. (William Butler), 1865-1939--Study and teaching.
Princeton subject headings:
English poetry--20th century--History and criticism.
English poetry--Study and teaching (Higher)
English poetry--Study and teaching (Secondary)
Yeats, W. B. (William Butler), 1865-1939--Criticism and interpretation.