Columbia subject headings:
Harvard subject headings:
Prussia (Germany)--Civilization--19th century--Congresses.
Prussia (Germany)--Civilization--19th century.
Prussia (Germany)--Cultural policy--History--19th century--Congresses.
Prussia (Germany)--Intellectual life--19th century--Congresses.
Prussia (Germany)--Intellectual life--19th century.
Prussia (Germany)--Politics and government--1815-1870--Congresses.
Prussia (Germany)--Politics and government--1870-1947--Congresses.
Princeton subject headings:
Prussia (Germany)--Civilization--19th century.
Prussia (Germany)--Intellectual life--19th century.