Columbia subject headings:
Romania--History--1914-1918.
Romania--History--Charles I, 1866-1914.
Transylvania (Romania)--History.
Harvard subject headings:
Romania--History--1914-1918.
Romania--History--Charles I, 1866-1914.
Transylvania (Romania)--History.
Princeton subject headings:
Romania--History--1914-1918.
Romania--History--Charles I, 1866-1914.
Transylvania (Romania)--History.