Columbia subject headings:
Harvard subject headings:
Field recordings--Congresses.
Sound archives--Europe--Congresses.
Sound recordings--Congresses.
Sound recordings--Conservation and restoration--Europe--Congresses.
Sound--Recording and reproducing--Digital techniques--Congresses.
Sound--Recording and reproducing--Equipment and supplies--Congresses.
Princeton subject headings:
Sound archives--Europe--Congresses.
Sound recordings--Conservation and restoration--Europe--Congresses.
Sound--Recording and reproducing--Digital techniques--Congresses.