Columbia subject headings:
Baudouin I, King of the Belgians, 1930-1993.
Belgium--History--1914-
Léopold III, King of the Belgians, 1901-1983--Abdication.
Harvard subject headings:
Baudouin I, King of the Belgians, 1930-1993.
Belgium--History--1914-
Léopold III, King of the Belgians, 1901---Abdication.
Princeton subject headings:
Baudouin I, King of the Belgians, 1930-1993.
Belgium--History--1914-
Léopold III, King of the Belgians, 1901---Abdication.