Columbia subject headings:
Harvard subject headings:
Conference materials.
Mahler, Gustav, 1860-1911--Congresses.
Music--Austria--Vienna--20th century--Congresses.
Princeton subject headings:
Mahler, Gustav, 1860-1911--Congresses.
Music--Austria--Vienna--19th century--Congresses.
Music--Austria--Vienna--20th century--Congresses.