The holdings of the archive refer to diverse groups of documents that have been combined into a unit according to logically comprehensible aspects such as their origin, their context of origin and their factual content according to formal characteristics. These include, for example, the files of city and district administrations, but also collections of photographs and newspaper clippings. Almost all documents in an archive are assigned to collections that structure the archive. The holdings of the archive are available online in this portal and can be researched