Columbia subject headings:
Civilization--History--Congresses.
Hero worship--History--Congresses.
Heroes--Europe--History--Congresses.
Heroes--History--Congresses.
Heroes--Mythology--History--Congresses.
Harvard subject headings:
Civilization--History--Congresses.
Hero worship--History--Congresses.
Heroes--Europe--History--Congresses.
Heroes--History--Congresses.
Heroes--Mythology--History--Congresses.
Princeton subject headings:
Civilization--History--Congresses.
Hero worship--History--Congresses.
Heroes--Europe--History--Congresses.
Heroes--History--Congresses.
Heroes--Mythology--History--Congresses.