Columbia subject headings:
Harvard subject headings:
Diplomatic and consular service, Prussian--History.
Diplomats--Germany--Prussia.
Prussia (Germany)--History--1815-1870.
Prussia (Germany). Auswärtiges Amt.
Princeton subject headings:
Diplomatic and consular service, German--Germany--Prussia--History--19th century.
Prussia (Germany)--Foreign relations--19th century.