Columbia subject headings:
Austria--History--Maria Theresa, 1740-1780--Congresses.
Maria Theresa, Empress of Austria, 1717-1780.
Music--Austria--18th century--Congresses.
Schwarz, Vera, 1929---Congresses.
Harvard subject headings:
Maria Theresa, Empress of Austria, 1717-1780--Congresses.
Music--Austria--18th century--History and criticism--Congresses.
Princeton subject headings:
Maria Theresa, Empress of Austria, 1717-1780.
Music--Austria--18th century--History and criticism.
Music--Congresses.
Schwarz, Vera, 1929-1980.