Library catalogues - collective search engine of 87 Luxembourgish libraries

Find-eR - searches the European Commission libraries collections 

HEIDI - Catalogue for libraries of Heidelberg University

KVK - Karlsruhe Virtual Catalog

Library of Congress

Library of the Court of Justice of the EU / Curius - new catalogue

Peace Palace Library

Staatsbibliothek zu Berlin

SWB Online-Katalog - 1200 libraries in Baden-Wuerttemberg, Saxony, Saarland, and Rhineland- Palatinate - Database providing access for more than 66,000 awarded or in-progress theses.

UNBISnet - UN Bibliographic Information System

WorldCat - 10,000 libraries worldwide          

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