Columbia subject headings:
Harvard subject headings:
Düsseldorf (Germany)--Economic conditions.
Düsseldorf (Germany)--History.
Düsseldorf (Germany)--Social conditions.
Gerresheimer Glas--History.
Glass trade--Germany--History.
Princeton subject headings:
Düsseldorf (Germany)--Economic conditions.
Düsseldorf (Germany)--History.
Düsseldorf (Germany)--Social conditions.
Gerresheimer Glas--History.
Glass trade--Germany--History.