The 12th edition of the CD-ROM publication contains bibliographic data in the fields of education, culture, natural sciences, social and human sciences, communication and information from: i) the UNESCO bibliographic database, UNESBIB, giving 113,000 bibliographic references with internet links to full text documents; and ii) the UNESCO Thesaurus, giving a structured list of descriptors (7,000 terms in English and 8,500 terms in French, with Spanish translations of descriptors) for indexing and retrieving literature.