External Libraries' Catalogs

Local Libraries

•  University library of Heidelberg: Catalogs of libraries of the University Heidelberg and associated institutes.
• Catalog of the library at the Max-Planck-Institute for Astronomy.

Nationwide Libraries

•  Deutsche Nationalbibliothek: The German National Library is the central archival library and national bibliographic center for the Federal Republic of Germany.
• Karlsruhe Virtual Catalogue: Karlsruhe Virtual Catalog KVK - more than 500 million books and serials in library and book trade catalogs worldwide.
• Südwestdeutscher Bibliotheksverbund: This bibliographic database references all kinds of media of more than 1000 libraries in Baden-Wuerttemberg, Saxony, Saarland, and Rhineland-Palatinate. It contains 47 million holding records for about 12 million titles of mainly scientific literature. These comprise 1.2 million holding records of 350.000 journals.
• Technical Information and University Library Hannover: In its role as the German National Library of Science and Technology and the related basic sciences, the TIB/UB has spent decades successfully meeting the challenge of being an innovative and competent information provider.

International Libraries

•  Library of Congress: The American National library.