Columbia subject headings:
Civilization, Western--Congresses.
Europe--Foreign relations--United States--Congresses.
United States--Foreign relations--Europe--Congresses.
Harvard subject headings:
Civilization, Western--Congresses
Europe--Foreign relations--United States--Congresses.
United States--Foreign relations--Europe--Congresses.
Princeton subject headings:
Civilization, Western--Congresses.
Europe--Foreign relations--United States--Congresses.
United States--Foreign relations--Europe--Congresses.