General
Austria
Belgium, Netherlands, and Luxembourg
Finland
France
Germany
Greece
Ireland
Italy
Scandinavia
Spain and Portugal
Switzerland
United Kingdom
- Center for Research Libraries
- Libdex - Worldwide directory of library catalogs
- Karlsruhe Virtual Catalogue - Access to books and serials in library and book trade catalogs worldwide
- European Library - Portal for 43 national libraries of Europe
- Gesamtkatalog der Wiegendrucke
- WorldCat
- Österreichische Nationalbibliothek - Austrian National Library
- Österreichischer Bibliothekenverbund: Gesamtkatalog
- Bibliotheken Online
- Austrian libraries
Belgium, Netherlands, and Luxembourg
- Koninklijke Bibliotheek van België - Royal Library of Belgium
- Koninklijke Bibliotheek - National Library of the Netherlands
- Bibliothèque nationale de Luxembourg - National Library of Luxembourg
- Archives de L'Etat en Belgique - State Archives in Belgium
- Kansalliskirjasto - National Library of Finland
- Bibliothèque nationale de France - French National Library
- Archives Nationales
- Catalogue Collectif de France
- Deutsche Nationalbibliothek - German National Library
- Die Deutsche Digitale Bibliothek
- Bayerische Staatsbibliothek
- OPAC der Zeitschriftendatenbank
- Deutsche Bibliotheken Online
- VD16 -- Verzeichnis der im deutschen Sprachraum erschienenen Drucke des 16. Jahrhunderts
- VD17 -- Verzeichnis der im deutschen Sprachraum erschienenen Drucke des 17. Jahrhunderts
- Ethnike Bibliotheke tes Hellados - National Library of Greece
- Music Library of Greece
- Leabharlann Náisiúnta na hÉireann - National Library of Ireland
- Bar Council of Ireland Law Library
- Research library catalogs in Ireland (IRIS)
- COPAC - online catalog of over 80 academic, national, and specialist libraries in the UK and Ireland
- Biblioteca Nazionale Centrale di Firenze - National Central Library of Florence
- Biblioteca Nazionale Centrale di Roma - National Central Library of Rome
- Biblioteche SBN - Italian National Bibliography
- Italian Periodicals Catalogue (ACNP)
- AIB. Italian Library Catalogs
- Archivio Centrale dello Stato
- Direzione Generale per i Beni Librari e gli Istituti
- Istituto Centrale per il Catalogo Unico delle Biblioteche Italiane e per le Informazioni Bibliografiche
- Archivio Segreto Vaticano
- Libraries on the Web: Italy - From the Berkeley Digital Library
- Fondazione Archivio Diaristico Nazionale
- Biblioteca e Raccolta Teatrale del Burcardo
- Archivi in Rete (Firenze)
- Biblioteca Provinciale "T. Stigliani" di Matera
- Università degli Studi di Roma "La Sapienza"
Scandinavia (Norway, Sweden, and Denmark)
- Kungliga biblioteket - Sveriges nationalbibliotek - National Library of Sweden
- Nasjonalbiblioteket - The National Library of Norway
- Det Kongelige Bibliotek - National Library of Denmark and Copenhagen University Library
- BIBSYS - Norweigan Union Catalog
- Nordic Libraries
- Libris - Union catalog of Sweden
- Biblioteca Nacional de España - National Library of Spain
- Biblioteca Nacional de Portugal - National Library of Portugal
- Biblioteca de Catalunya
- Biblioteca de la Universidad Complutense de Madrid
- Archivo General del Ministerio de Educación y Cultura
- Catálogos de las bibliotecas públicas en España
- Libraries on the Web: Spain From the Berkeley Digital Library
- Centro de Documentacion Musical de Andalucia
- Biblioteca de la Escuela de Estudios Hispano-Americanos
- Swiss National Library
- Schweizerische Landesbibliothek: Helveticat
- Swiss National Bibliography
- Hochschulbibliotheken Schweiz
- IDS: Informationsverbund Deutschschweiz
- SWITCH: Swiss Libraries
- The British Library
- National Library of Scotland
- National Library of Wales
- Consortium of University Research Libraries (CURL)
- M25 Consortium of Higher Education Libraries
- COPAC - online catalog of over 80 academic, national, and specialist libraries in the UK and Ireland
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