Columbia subject headings:
Denmark--Foreign relations--1947-1972.
Denmark--Foreign relations--1972-
European Union--Denmark.
European Union--Ireland.
European Union--Netherlands.
Ireland--Foreign relations--1922-
Netherlands--Foreign relations--1948-
Harvard subject headings:
Denmark--Foreign relations--1947-1972
Denmark--Foreign relations--1947-1972.
Denmark--Foreign relations--1972-
European Union countries--Foreign relations
European Union countries--Politics and government
European Union--Denmark.
European Union--Ireland.
European Union--Netherlands.
Ireland--Foreign relations--1922-
National security--European Union countries
Netherlands--Foreign relations--1948-
Princeton subject headings:
Denmark--Foreign relations--1947-1972.
Denmark--Foreign relations--1972-
European Union--Denmark.
European Union--Ireland.
European Union--Netherlands.
Ireland--Foreign relations--1922-
Netherlands--Foreign relations--1948-