| Subclass Q |
Science (General) |
| Subclass QA |
Mathematics |
| Subclass QB |
Astronomy |
| Subclass QC |
Physics |
| Subclass QD |
Chemistry |
| Subclass QE |
Geology |
| Subclass QH |
Natural history - Biology |
| Subclass QK |
Botany |
| Subclass QL |
Zoology |
| Subclass QM |
Human anatomy |
| Subclass QP |
Physiology |
| Subclass QR |
Microbiology |
https://www.loc.gov/aba/cataloging/classification/lcco/lcco_q.pdf