Columbia subject headings:
Friendship in literature--Congresses.
Friendship--Congresses.
Poetry--History and criticism--Congresses.
Harvard subject headings:
Friendship in literature--Congresses.
Friendship--Congresses.
Poetry--History and criticism--Congresses.
Princeton subject headings:
Friendship in literature--Congresses.
Friendship--Congresses.
Poetry--History and criticism--Congresses.