Columbia subject headings:
Harvard subject headings:
Prussia (Germany)--History, Military--18th century--Congresses.
Prussia (Germany)--History, Military--19th century--Congresses.
Prussia (Germany). Armee--History--18th century--Congresses.
Prussia (Germany). Armee--History--19th century--Congresses.
Princeton subject headings:
Prussia (Kingdom). Armee--History--18th century.
Prussia (Kingdom). Armee--History--19th century.