Columbia subject headings:
Biography--Congresses.
Genius--Congresses.
Mozart, Wolfgang Amadeus, 1756-1791--Congresses.
Wittgenstein, Ludwig, 1889-1951--Congresses.
Harvard subject headings:
Composers--Biography--Research--Congresses.
Mozart, Wolfgang Amadeus, 1756-1791--Congresses.
Philosophers--Biography--Research--Congresses.
Wittgenstein, Ludwig, 1889-1951--Congresses.
Princeton subject headings:
Composers--Biography--Research--Congresses.
Mozart, Wolfgang Amadeus, 1756-1791--Congresses.
Philosophers--Biography--Research--Congresses.
Wittgenstein, Ludwig, 1889-1951--Congresses.