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- Germany--Economic conditions--19th century (2)
- Engels, Friedrich, 1820-1895 (1)
- Germany--Politics and government--1815-1866 (1)
- Germany--Politics and government--19th century (1)
- Marx, Karl, 1818-1883 (1)
- Rheinische Zeitung--History (1)
- Rhineland (Germany)--History (1)
- Socialism--Germany--History--19th century (1)