Columbia subject headings:
Harvard subject headings:
Firearms industry and trade--Germany--Prussia.
Firearms--Germany--Prussia--History--19th century.
Prussia (Germany). Armee--Firearms--History--19th century.
Princeton subject headings:
Firearms industry and trade--Germany--Prussia.
Firearms--Germany--Prussia--History--19th century.
Prussia (Kingdom). Armee--Firearms--History--19th century.