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- Lagarde, Paul de, 1827-1891 (DE-588)118725971 gnd1
- Lagarde, Paul de. swd1
- Marx, Karl, 1818-18831
- Marx, Karl, 1818-1883 (DE-588)118578537 gnd1
- Marx, Karl. swd1
- Mill, John Stuart, 1806-18731
- Mill, John Stuart, 1806-1873 (DE-588)118582461 gnd1
- Mill, John Stuart. swd1