The books stacks are divided into three levels:
- The upper level contains:
- oversize books (Q.)
- folios (F.)
- Dewey Classification numbers 001-510.4
- The main level contains:
- Dewey Classification numbers 510.5-514
- Microfilm (FILM)
- The lower level contains:
- Dewey Classification numbers 515-999
- biographies (B.)
- Library of Congress classification QA