Columbia subject headings:
Hungary--History--20th century.
Hungary--History--Revolution, 1918-1919.
Károlyi, Mihály, 1875-1955.
Presidents--Hungary--Correspondence.
Harvard subject headings:
Hungary--History--20th century
Hungary--History--20th century--Sources.
Hungary--History--Revolution, 1918-1919
Hungary--History--Revolution, 1918-1919--Sources.
Károlyi, Mihály, 1875-1955
Károlyi, Mihály, 1875-1955. Correspondence
Presidents--Hungary--Correspondence.
Princeton subject headings: