Columbia subject headings:
Austria--History--Revolution, 1848-1849.
Vienna (Austria)--History--Siege, 1848.
Harvard subject headings:
Austria--History--Revolution, 1848-1849.
Vienna (Austria)--History--Siege, 1848.
Princeton subject headings:
Austria--History--Revolution, 1848-1849.
Vienna (Austria)--Siege, 1848.