With our online catalogue you browse within the stock of our libraries of Cologne, Brühl, Neuss, Mainz, Aachen, Rostock. We offer an interlibrary loan service between the libraries in Cologne, Brühl, and Neuss.
You'll receive the information if the material is borrowed or available. With your own account you can also extent the loan period by yourself. You need a password for that, which you can obtain from the library team.