Columbia subject headings:
Art metal-work, Byzantine--Congresses.
Art metal-work, Medieval--Congresses.
Art metal-work--Conservation and restoration--Congresses.
Harvard subject headings:
Art metal-work, Byzantine--Congresses.
Art metal-work, Medieval--Congresses.
Art metal-work--Conservation and restoration--Congresses.
Princeton subject headings:
Art metal-work, Medieval--Congresses.