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Subclass QH
| QH1-278.5 | Natural history (General) | |
| QH1-(199.5) | General Including nature conservation, geographical distribution | |
| QH201-278.5 | Microscopy | |
| QH301-705.5 | Biology (General) | |
| QH359-425 | Evolution | |
| QH426-470 | Genetics | |
| QH471-489 | Reproduction | |
| QH501-531 | Life | |
| QH540-549.5 | Ecology | |
| QH573-671 | Cytology | |
| QH705-705.5 | Economic biology | |
