Columbia subject headings:
Latin literature--History and criticism--Congresses.
Pliny, the Younger--Congresses.
Harvard subject headings:
Didactic literature, Latin--History and criticism--Congresses.
Latin letters--History and criticism--Congresses.
Latin literature--History and criticism--Congresses.
Letter writing, Latin--History--To 1500--Congresses.
Pliny, the Younger--Congresses.
Pliny, the Younger--Criticism and interpretation--Congresses.
Rome--Moral conditions--Congresses.
Princeton subject headings:
Latin literature--History and criticism--Congresses.
Pliny, the Younger--Congresses.