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- Marx, Karl, 1818-1883 (29)
- Engels, Friedrich, 1820-1895 (8)
- Kant, Immanuel, 1724-1804 (3)
- Communists--Biography (2)
- Communists--Europe--Biography--Pictorial works (1)
- Criticism (Philosophy)--History (1)
- Economics--Collected works (1)
- Feuerbach, Ludwig, 1804-1872 (1)
- Germany--Economic conditions--19th century (1)
- Germany--Politics and government--1815-1866 (1)
- Hegel, Georg Wilhelm Friedrich, 1770-1831 (1)
- Heine, Heinrich, 1797-1856 (1)
- History--Philosophy (1)
- Materialism (1)
- Revolutions (1)
- Revolutions--France--History (1)
- Rheinische Zeitung--History (1)
- Rhineland (Germany)--History (1)
- Rousseau, Jean Jacques, 1712-1778 (1)
- Socialism--Collected works (1)
- Socialism--Germany--History--19th century (1)
- Stein, Lorenz von, 1815-1890 (1)
- Tocqueville, Alexis de, 1805-1859 (1)