- Dialectical materialism (3)
- Philosophy (2)
- Campanella, Tommaso, 1568-1639 (1)
- Herzen, Aleksandr, 1812-1870 (1)
- Idealism (1)
- Knowledge, Theory of (1)
- Materialism (1)
- Plekhanov, Georgiĭ Valentinovich, 1856-1918 (1)
- Tolstoy, Leo, graf, 1828-1910 (1)
- Wilde, Oscar, 1854-1900--Criticism, Textual (1)
- Zasulich, V. I., 1849-1919 (1)