The National Library of Scotland (NLS) (, ) is the legal deposit library of Scotland and is one of the country's National Collections. As one of the largest libraries in the United Kingdom, it is a member of Research Libraries UK (RLUK) and the Consortium of European Research Libraries (CERL). There are over 24 million items held at the Library in various formats including books, annotated manuscripts and first-drafts, postcards, photographs, and newspapers. The library is also home to Scotland's Moving Image Archive, a collection of over 46,000 videos and films. Notable items amongst the collection include copies of the Gutenberg Bible, Charles Darwin's letter with which he submitted the manuscript of On the Origin of Species, the First Folio of Shakespeare, the Glenriddell Manuscripts, and the last letter written by Mary Queen of Scots. It has the largest collection of Scottish Gaelic material of any library in the world. Buildings The Library's main public building is in Edinburgh city centre on George IV Bridge, between the Old Town and the university quarter. This building is Category A listed. Exhibitions are frequently held here, with past examples including 'Northern Lights: The Scottish Enlightenment' (21 June 2019 - 18 April 2020), a display which explored Scotland's contribution to the progress of Enlightenment, and 'The International Style of Muriel Spark' (8 December 2017 - 13 May 2018), a celebration of her life and literary achievements. As the library is a not a lending library, this building is one of several venues where the public are able to visit and consult primary materials in the reading rooms. There are two reading rooms in the George IV building, and a third Multimedia Room for consulting non-written materials: General Reading Room - a space for people to conduct research using materials like journals, newspapers and newer, post-1850 books. Special Collections Reading Room - a room where the public are able to access old and rare materials, such as rare books and manuscripts. Multimedia Room - a space to consult non-written materials, such as microforms and photographs. There is also a more modern building, constructed in the 1980s, in a residential area on the south side of the town centre, on Causewayside. This was built to accommodate some of the specialist collections, such as maps and science collections, and to provide extra large-scale storage. There is one reading room located here also; the Maps Reading Room,