Columbia subject headings:
Austria--History--1789-1815--Congresses.
Austria--History--1815-1848--Congresses.
Europe--History--1789-1900--Congresses.
Harvard subject headings:
Austria--History--1789-1815--Congresses.
Austria--History--1815-1848--Congresses.
Europe--History--1789-1900--Congresses.
Princeton subject headings:
Austria--History--1789-1815--Congresses.
Austria--History--1815-1848--Congresses.
Europe--History--1789-1900--Congresses.