The Zentralbibliothek Zürich (ZB) is the cantonal, city and university library of Zurich. With over six million documents and more than half a million visitors per year, the ZB is one of the largest Swiss libraries. As a university library the Zentralbibliothek collects academic literature on all the subjects taught at the University of Zurich, with a special focus on the liberal arts and social sciences. As the Turicensia guardian it collects all publications published by Zurich-based publishing houses, all works of Zurich-based authors and all literature about Zurich itself. As communal and cantonal library the ZB also offers a wide selection of popular literature – from travel guides and self-help books to biographies, crime thrillers, DVDs and sound recordings. The ZB’s five Special Collections – Graphics, Manuscripts, Maps, Music and Old Prints – boast a wealth of historical and current archives, bequests, image and sound documents.