Columbia subject headings:
Artillery--Germany--History--19th century.
Industries--Germany--History--19th century.
Weapons--Germany--History--19th century.
Harvard subject headings:
Artillery--Germany--History.
Military weapons--Germany--History.
Princeton subject headings:
Ordnance--Manufacture--History--19th century.
Ordnance--Manufacture--History--20th century.
Weapons industry--Germany--History--19th century.
Weapons industry--Germany--History--20th century.