| Subject | Subject classification | Location |
| Architecture, town-planning | WSA - WWZ | PB, groundfloor, right |
| Architecture, town-planning | WWZ - XAZ | PB, intermediate floor |
| Architecture, town-planning: bound periodicals | PB, upper floor | |
| Arts | JXA - KFZ | AR, floor 1 |
| Astronomy | VAA - VCZ VEU - VHZ | AR, floor 2 |
| Astrophysics | VDA - VET | ENC |
| Authors in humanities and social sciences | IWA - JWZ | AR, floor 1: extension |
| Biology | VNA - VTZ | AR, floor 2 |
| Chemistry | UNA - UZZ | AR, floor 2 |
| Civil engineering, surveying | XBA - XHZ | PB, intermediate floor |
| Civil engineering, surveying: bound periodicals | PB, upper floor | |
| Computer science | TTA - TZZ | H, floor 4 |
| Economic and social statistics | QFA - QHA | H and AR, floor 1: extension |
| Economic education and vocational studies | QHN - QKU | AR, floor 1: extension |
| Economics | PHA - QHA | H, floor 4 |
| Education, social education, social services | HYA - IKZ | AR, floor 1: extension |
| Electrical engineering | XVA - YHZ | H, floor 4 |
| English studies | DEA - EOZ | AR, floor 2 |
| General reference works | AAA - AZZ | AR, floor 0 and AR, floor 01: open stack |
| Geo sciences | MRA - NMZ | AR, floor 2 |
| German studies | BTA - DDZ | AR, floor 2 |
| History | KXA - MQZ | AR, floor 1 |
| Law | QMA - QWZ | H, floor 5 |
| Linguistics and literary studies | BEA - BSZ | AR, floor 2 |
| Literature for children and teenagers (Collection) | BSJ - BSM | AR, floor 01: open stack |
| Mechanical engineering | XIA - XUZ | PB, groundfloor, left |
| Media studies | KKS - KNZ | AR, floor 1 |
| Medicine | VUA - VZZ | AR, floor 2 |
| Music | KGA - KKR | AR, floor 1 |
| Natural sciences in general | STA - SZZ | AR, floor 2 |
| Philologies (except: English studies, German studies, Romance studies) | GTA - HGZ | AR, floor 2 |
| Philosophy | HIA - HPZ | AR, floor 1: extension |
| Physics | UAA - ULZ | ENC |
| Physics (didactics) | UMA - UMZ | AR, floor 2 |
| Political science | OTA - PGZ | AR, floor 1: extension |
| Psychology | HQA - HXZ | AR, floor 1: extension |
| Romance studies | EPA - FZZ | AR, floor 2 |
| Siegerlandsammlung (Literature collection concerning the Sieg Region) | ZXA - ZXZ | AR, geschlossenes Magazin |
| Social sciences in general | NOA - NWZ | AR, floor 1: extension |
| Sociology | NXA - OSZ | AR, floor 1: extension |
| Sports | KOA - KWZ | AR, floor 1 |
| Technology in general | WAA - WHZ | PB, groundfloor, left |
| Technology, other fields | ZEA - ZWZ | PB, groundfloor, left |
| Theology | ILA - IVZ | AR, floor 1 |
Locations/contact
AR:
Main Library
Adolf-Reichwein-Straße 2
H:
Branch Library Hölderlinstraße
Hölderlinstr. 3, building C, floor 4
PB:
Branch Library Paul-Bonatz-Straße
Paul-Bonatz-Straße 9-11, building A, floor 0
ENC:
Branch Library Emmy-Noether-Campus
Walter-Flex-Straße 3, building D, floor 4