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Subclass QR
| QR1-502 | Microbiology | |
| QR1-74.5 | General | |
| QR75-99.5 | Bacteria | |
| QR99.6-99.8 | Cyanobacteria | |
| QR100-130 | Microbial ecology | |
| QR171 | Microorganisms in the animal body | |
| QR180-189.5 | Immunology | |
| QR355-502 | Virology | |
Page:Library of Congress Classification Outline.djvu/249
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