University library catalogues and directories
BibSearch (Discovery Service)
Classic online catalogue
Shelving classification and new acquisitions
Directory of periodicals
Directory of TGLs
Directory of East German DDR-Baukataloge
Domestic and international catalogues
General catalogue of Weimar libraries
GBV library network directories
Karlsruhe Virtual Catalogue (KVK)
German National Library (DNB)
Bibliothèque nationale de France
British Library
Library of Congress
Worldcat
Domestic and international libraries offering full text access
Deutsche Digitale Bibliothek
Europeana
Domestic periodicals directories
Zeitschriftendatenbank ZDB
Elektronische Zeitschriftenbibliothek EZB