The University of Essex hosts "the largest collection of accessible computer-readable data in the social sciences and humanities in the United Kingdom," housing over 7000 datasets of information for secondary research in a variety of disciplines. Users can search the catalog and indexes by subject or keyword using the BIRON (Information Retrieval On-line) system or its associated thesarus, HASSET (Humanities And Social Science Electronic Thesaurus). Bibliographic information returned is comprehensive. The site also features links to a number of other archives and social science information services, including the CESSDA Integrated Data Catalog, "a unified collection of mainly European social science data archive catalogues, which can be searched through one common interface." Authorized users (conditions vary by dataset) can order data in a variety of formats and media.