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Subclass HX
| HX1-970.7 | Socialism. Communism. Anarchism | |
| HX519-550 | Communism/socialism in relation to special topics | |
| HX626-696 | Communism: Utopian socialism, collective settlements | |
| HX806-811 | Utopias. The ideal state | |
| HX821-970.9 | Anarchism | |
