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Up a level- Library of Congress Subject Areas (13555)
- Q Science (641)
- Q Science (General) (98)
- QA Mathematics (506)
- QC Physics (17)
- QD Chemistry (1)
- QE Geology (2)
- QK Botany (2)
- QL Zoology (5)
- QM Human anatomy (8)
- QP Physiology (11)
- QR Microbiology (1)
- Q Science (641)
Number of items at this level: 0.