Library networks are collectives of several libraries and combine in their catalogues the bibliographies of all included libraries.
Gemeinsamer Bibliotheksverbund (GBV)Kooperativer Bibliotheksverbund Berlin Brandenburg (KOBV)Nordrhein-Westfälischer Bibliotheksverbund (HBZ)Hessischer Bibliotheksverbund (HeBIS)Südwestdeutscher Bibliotheksverbund (SWB)Bibliotheksverbund Bayern (BVB)
British Union Catalogue (COPAC)Online Computer Library Center (OCLC)
