Columbia subject headings:
Atlantic Union (U.S.)
Atlantic Union.
Europe--Foreign relations--North America.
International organization.
North America--Foreign relations--Europe.
Harvard subject headings:
Atlantic Union (U.S.)
Atlantic Union.
Europe--Foreign relations--North America.
International organization.
North America--Foreign relations--Europe.
Princeton subject headings:
Atlantic Union.
Europe--Foreign relations--North America.
International organization.
North America--Foreign relations--Europe.