Columbia subject headings:
Harvard subject headings:
Austria--Foreign relations--European Union countries--Congresses.
Europe, Central--Church history--20th century--Congresses.
Europe, Central--Foreign relations--Congresses.
European Union countries--Foreign relations--20th century--Congresses.
European Union--Membership--Congresses.
Germany--Foreign relations--European Union countries--Congresses.
Soviet Union--Foreign relations--European Union countries--Congresses.
Princeton subject headings:
Austria--Foreign relations--20th century.
Europe, Central--Church history--20th century--Congresses.
Europe, Central--Foreign relations--Congresses.
Europe, Central--Foreign relations--European Union countries--Congresses.
Europe, Central--Foreign relations--Russia (Federation)--Congresses.
European Union countries--Foreign relations--Europe, Central--Congresses.
Russia (Federation)--Foreign relations--Europe, Central--Congresses.