The 50th edition of International Directory of Arts (IDA) contains about 143,000 addresses (including telephone and fax numbers, eMail and URL) from all over the world: Museums and Public Galleries Universities, Academies, Schools Associations Art and Antique Trade, Numismatics Art and Antiques Fairs Galleries Auctioneers Restorers Art Publishers Art Journals Antiquarians and Art Booksellers Within each chapter, addresses are arranged by country and within country, sections are set our alphabetically by city. Details of the specializations of museums, as well as the names of curators and senior academic museum staff are also included. The address contents were revised and updated for this edition following a questionnaire mailing. The revision also took into account numerous national and international reference works.