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