Columbia subject headings:
Glass trade--Germany--Gernheim--History--19th century.
Glassworkers--Germany--Gernheim--History--19th century.
Harvard subject headings:
Glass trade--Germany (West)--Gernheim--History--19th century.
Glassworkers--Germany (West)--Gernheim--History--19th century.
Princeton subject headings:
Glass manufacture--Germany--Gernheim--History.
Glassworkers--Germany--Gernheim--History.