Twardowski, Kazimierz (1866–1938)
Engels, Friedrich (1820–1895) Marx, Karl (1818–1883)
Cousin, Victor (1792–1867)
Birecki, Leon (1858– )
Garbowski, Tadeusz (1869–1940)
Caro, Leopold (1864–1939)
Guizot, François (1787–1874) Forster, Karol (1800–1879)
Biegański, Władysław (1857–1917)
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