In HZB, literature is purchased exclusively through the library which administers the single joint literature budget for the whole of HZB. Accordingly, after purchase literature becomes HZB property. The default place for literature in print is the Wannsee library complex, notably the magazine in the basement below the hall, from which literature is offered to anyone at HZB, for inspection or for loan, through pick-up or delivery. The inventory of books within HZB can also be searched in the web (OPAC) catalogue. Books, journals and other literature can optionally be put up in department libraries provided this is deemed warranted by local requirements and still economical.