Columbia subject headings:
Art metal-work--Europe--History.
Art metal-work--Technique.
Enamel and enameling--Europe--History.
Enamel and enameling--Technique.
Harvard subject headings:
Enamel and enameling--History.
Enamel and enameling--Technique.
Princeton subject headings:
Art metal-work--Europe--History.
Art metal-work--Technique.
Enamel and enameling--Europe--History.
Enamel and enameling--Technique.