The work directly addresses multiple aspects that are relevant to the CCQ journal in general, and the special issue on national bibliographies in particular. This work demonstrates how comprehensive data harmonization is essential for accurate and useful data retrieval tasks and relevant for the overall usability of the catalogue information, and how the available classification and subject analyses, geographical information, and other data can be utilized, augmented, enriched and validated based on auxiliary information sources.information sources, such as digital maps for instance.  Integration of national bibliographies, special collections, and archives is relevant for international aspects of digital cataloging. As such the work highlights specific bottlenecks and shortcomings in the available cataloging and classification information, and can therefore provide relevant information for education, training, and management of cataloguing. Finally, we demonstrate how bibliographic catalog records can be used as a digital research resource, rather than a mere information retrieval tool.