Columbia subject headings:
Harvard subject headings:
Germany--History--Revolution, 1848-1849--Sources.
Germany--Politics and government--1848-1849--Sources.
Liberalism--Germany--History--19th century--Sources.
Political persecution--Germany--History--19th century--Sources.
Politicians--Germany--Correspondence.
Princeton subject headings:
Germany--History--1848-1870--Sources.
Germany--History--Revolution, 1848-1849--Sources.