# Subject areas (In order of LIBRARY OF CONGRESS CLASSIFICATION)
## Science (General) (Q)
## Mathematics (QA)
## Astronomy (QB)
## Physics (QC)
## Chemistry (QD)
## Geology (QE)
## Natural history (QH)
## Botany (QK)
## Zoology (QL)
## Human anatomy (QM)
## Physiology (QP)
## Microbiology (QR)
