Library OPACs containing UDC codes

Below is a selection of catalogues in which there is an option to search and browse UDC numbers.

(410) United Kingdom

• Imperial College and Science Museum Libraries
• RIBA British Architectural Library
• University of Surrey Library

(430) Germany

• Deutscher Wetterdienst
• Freiburg University of Mining and Technology

(437) Czech Republic

• The National Library of the Czech Republic

(438) Poland

• The National Library of Poland Library Catalogue

(439) Hungary

• Hungarian National Union Catalogue (MOKKA)
  Search tip: abbreviation for UDC in Hungarian is 'ETO'
• Hungarian National Library catalogue - Országos Széchényi Könyvtár (OSZK) Katalogus

(440) France

• Bibliothé, Service Commun de la Documentation - Universite Lyon

(450) Italy

• ACNP - Catalogo italiano dei periodici
• Inter Library Center, Bologna University
• SBN - Servizio bibliotecario nazionale
• The Abdus Salam - International Centre for Theoretical Physics Library

(469) Portugal

• National Bibliographic Database
• Fundação Calouste Gulbenkian, Biblioteca de Arte

(493) Belgium

• Universiteitsbibliotheek K.U.Leuven

(494) Switzerland

• Eidgenössische Technische Hochschule (ETH) in Zuerich

(494.9) Liechtenstein

• Liechtensteinische Landesbibliothek

(497.1) Serbia

• Virtual Library of Serbia

(497.4) Slovenia

• Virtual Library of Slovenia

(497.5) Croatia

• National and University Library, Zagreb
• Croatian Academy of Sciences and Arts Library
• Zagreb City Library

(498) Romania

• Central University Libarary in Bucharest

(94) Australia

• National Acoustic Laboratories Library