# 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)