Columbia subject headings:
Harvard subject headings:
Motion picture film--Preservation--Congresses.
Sound recordings--Conservation and restoration--Congresses.
Video tapes--Conservation and restoration--Congresses.
Video tapes--Preservation--Congresses.
Princeton subject headings:
Audio-visual archives--Congresses.
Film archives--Congresses.
Motion picture film--Preservation--Congresses.
Motion picture film--Storage--Congresses.
Sound recordings--Conservation and restoration--Congresses.
Video recordings--Conservation and restoration--Congresses.