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Subclass BD
| BD10-701 | Speculative philosophy | |
| BD10-41 | General philosophical works | |
| BD95-131 | Metaphysics | |
| BD143-237 | Epistemology. Theory of knowledge | |
| BD240-260 | Methodology | |
| BD300-450 | Ontology Including being, the soul, life, death | |
| BD493-701 | Cosmology Including teleology, space and time, structure of matter, plurality of worlds | |
