- Library of Congress Subject Areas (60601)
- Q Science (16945)
- Q Science (General) (778)
- QB Astronomy (716)
- QC Physics (1955)
- QD Chemistry (1582)
- QE Geology (65)
- QH Natural history (1811)
- QK Botany (104)
- QL Zoology (406)
- QM Human anatomy (89)
- QR Microbiology (770)
- Q Science (16945)