Short description: The Bavarian Union Catalogue (B3Kat) is the common catalog of the associations BVB (Bibliotheksverbund Bayern)and KOBV (Bibliotheksverbund Berlin-Brandenburg). In addition to the university libraries of the Federal states of Bavaria, Berlin and Brandenburg, the Bavarian State Library and numerous special libraries belong to the merger. For more information, see Bibliotheksverbund Bayern https://www.bib-bvb.de. Searchable fields: title (keywords), author, all fields, institution, ISBN/ISSN/ISMN, year, subject, classification, publisher/place. Operators: and, or, and not. Operators: and, or, and not.