room contains a picture by Ludwig von Hofmann, depicting Arcadia in Art Nouveau-style. The staircase displays a mural showing the founders of the German library. The Library also contains the German Museum of Books and Writing. The fourth expansion of the library began in 2007 and was opened to the public on 9 May 2011. Designed by Gabriele Glockler, whose concept for the building was "Cover. Shell. Content." it connects all sections of the building together for the first time. Building in Frankfurt am Main The current building of the Frankfurt branch was officially inaugurated on 14 May 1997. Stuttgart architects Arat-Kaiser-Kaiser were commissioned to design the building after winning an architectural competition in 1984. Planning was delayed however and construction didn't begin until 1992. With an appearance dominated by four main materials: exposed concrete, steel, glass and light Canadian Maple, it features over 300 workstations across three floors, with a large window providing illumination to all of them. Additional storage is located in three levels of underground storage expected to contain enough space until 2045. Inventory Total: 43.7 million items books: 17.3 million journals: 8 million audio records: 2.4 million electronic publications: 10.7 million See also German National Library of Economics (ZBW) German National Library of Medicine (ZB MED) German National Library of Science and Technology (TIB) List of libraries in Germany The Collection of German Prints ( or SDD) (GND) (Integrated Authority File) Books in Germany Notes References External links 1912 establishments in Germany Deposit libraries Libraries established in 1912 Libraries in Berlin National libraries