Catalogues, databases, e-books and e-journals are accessible throughout the whole university as well as at home via the library network.

It was established by the Germanist and bookseller Hans-Otto Mayer and not only comprises editions of complete works, rare first publications, manuscripts and translations into more than 40 languages but also secondary literature including an extensive archive of excerpts.

These valuable specimens, among them unica and fragments of seldom preserved "consume literature", show the beginnings of the art of printing.

They originate predominantly from workshops of Rhenish or Dutch printers and offer a rich panorama of the regional book production at the beginning of the modern era.

In other collections, the ULB unites rare, valuable and unique parts of holdings that are installed as an ensemble.