Columbia subject headings:
Franz Ferdinand, Archduke of Austria, 1863-1914.
Leopold Salvator, Archduke of Austria, 1863-1931.
Harvard subject headings:
Franz Josef, archduke of Austria, 1905-
Leopold Salvator, Archduke of Austria, 1863-1931.
Princeton subject headings:
Franz Josef, Archduke of Austria, 1905-
Leopold Salvator, Archduke of Austria, 1863-1931.