Columbia subject headings:
Plague--Rome--History--2nd century--Congresses.
Rome--History--Marcus Aurelius, 161-180--Congresses.
Harvard subject headings:
Plague--Rome--History--2nd century--Congresses.
Rome--History--Marcus Aurelius, 161-180--Congresses.
Princeton subject headings:
Plague--Rome--History--2nd century--Congresses.
Rome--History--Marcus Aurelius, 161-180--Congresses.