Columbia subject headings:
Hungary--Relations--Romania.
Romania--Relations--Hungary.
Transylvania (Romania)--Ethnic relations.
Transylvania (Romania)--History.
Harvard subject headings:
Hungarians--Romania--Transylvania.
Hungary--Foreign relations--Romania
Romania--Foreign relations--Hungary.
Transylvania (Romania)--Ethnic relations.
Princeton subject headings:
Hungary--Relations--Romania.
Romania--Relations--Hungary.
Transylvania (Romania)--Ethnic relations.
Transylvania (Romania)--History.