Columbia subject headings:
Harvard subject headings:
Europe--Foreign economic relations--United States.
Europe--Foreign relations--United States.
Europe--Strategic aspects.
Military assistance, American--Europe.
National security--Europe
North Atlantic Treaty Organization
United States--Foreign economic relations--Europe.
United States--Foreign relations--Europe.
Princeton subject headings:
Europe--Foreign economic relations--United States.
Europe--Foreign relations--United States.
Europe--Strategic aspects.
Military assistance, American--Europe.
North Atlantic Treaty Organization.
United States--Foreign economic relations--Europe.
United States--Foreign relations--Europe.