Columbia subject headings:
Harvard subject headings:
Cologne (Germany)--Social conditions.
Demokratische Gesellschaft (Cologne, Germany)
Germany--Politics and government--1815-1866.
Princeton subject headings:
Cologne (Germany)--History--Revolution, 1848-1849.
Cologne (Germany)--Politics and government.
Demokratische Gesellschaft (Cologne, Germany)--History.
Political parties--Germany--History.