- Catalogue of the ‘Universitäts- und Landesbibliothek Bonn’
- Catalogue of the institute’s libraries of the University of Bonn
- Catalogue of the University of Cologne (including all libraries)
- Library of the ‘Franz Joseoph Dölger-Institut’
- Library of the ‘LVR-LandesMuseum Bonn’
- Library of the ‘Römisch-Germanischen Museum Köln’
- Library of the DAI-Commission for Non-European Cultures (KAAK) Bonn
- Erzbischöfliche Diözesan- und Dombibliothek Köln