Oxford Reference Online brings together language and subject reference works from one of the world's biggest reference publishers into a single cross-searchable resource. The Premium Collection enhances the 100+ books in the Core Collection with an expanding range of key titles in the acclaimed Oxford Companions series plus the Oxford Dictionary of Quotations. This means an additional 140,000 entries, including 50,000 longer, in-depth, signed entries with bibliographies. Subscribers to the Premium Collection also benefit from improved search functionality which makes it easy to choose between longer or shorter entries from subject reference titles, definitions from English or bilingual dictionaries, and quotations. The Premium Collection is updated regularly with new titles, new editions, new entries, full-colour maps and illustrations, timelines, weblinks, and bibliographies.