Columbia subject headings:
English literature--Irish authors--History and criticism.
Heaney, Seamus, 1939-2013--Criticism and interpretation.
Ireland--In literature.
Harvard subject headings:
Heaney, Seamus, 1939-2013--Criticism and interpretation.
Northern Ireland--In literature.
Princeton subject headings:
Heaney, Seamus, 1939-2013--Criticism and interpretation.
Northern Ireland--In literature.