Columbia subject headings:
Coins--Congresses.
Medals--Congresses.
Numismatics--Congresses.
Harvard subject headings:
Coins--Congresses.
Medals--Congresses.
Numismatics, Greek--Congresses.
Numismatics, Roman--Congresses.
Numismatics--Congresses.
Princeton subject headings:
Numismatics, Greek--Congresses.
Numismatics, Roman--Congresses.
Numismatics--Congresses.