The State and University Library – Aarhus University Library
bibliotek.dk
At bibliotek.dk you can order books, journals, music, articles etc. from any library in Denmark and have it delivered to your local library, where you can pick it up.
KVK - Karlsruher Virtueller Katalog
Search in large library databases from all over the world.
WorldCat
A nice supplement to the Karlsruhe Virtual Catalogue. This is an American joint catalogue, with ever more European libraries participating.
Gabriel - Gateway to Europe's National Libraries
Libweb
Access to libraries in over 100 countries.
Library of Congress Online Catalog
Libris. Sweden
Swedish joint catalogue and national bibliography.
Odin
The catalogue of the University of Southern Denmark’s Library.
Nobel Library
Aarhus University’s library for - among others - Department of Culture and Society.