1. What is the connection between the German Newspaper Portal and the German Union Catalogue of Serials (ZDB)?

The German Union Catalogue of Serials (ZDB) lists newspapers and journals that can be found in German and Austrian libraries and archives. It assigns identifiers (ZDB IDs) that make each newspaper or journal uniquely and permanently identifiable. The German Newspaper Portal uses these identifiers to uniquely identify the newspapers. In addition, further metadata of a newspaper, such as publication history and publication frequency, are taken from the ZDB via the ZDB ID and displayed in the newspaper portal.

If a newspaper listed in the ZDB is available in the German Newspaper Portal, there is also a link from the corresponding ZDB entry to the associated newspaper portal holdings.