Columbia subject headings:
Harvard subject headings:
Germany--History--Revolution, 1848-1849.
Hesse (Germany)--History--Revolution, 1848-1849.
Nassau (Duchy)--History--Revolution, 1848-1849.
Rhine River Valley--History--19th century.
Princeton subject headings:
Germany--History--Revolution, 1848-1849.
Hesse (Germany)--History--1806-1918.
Rhineland-Palatinate (Germany)--History.