The Bibliothèque nationale de France watches over an inheritance together for five centuries through legal deposit and an active acquisitions policy. Its mission is to collect, list, preserve and enrich all fields of knowledge, collections of which it is responsible, and ensure access to the wider public. It brings together more than 30 million works, the first papyri to websites, via prints, photographs, manuscripts, maps, sound and visual documents, musical scores, coins and medals. The library hosts every year nearly 1.5 million visitors, readers and researchers on its four sites in Paris. Its Gallica digital library provides online access to more than three million documents.