The Argo give access to bibliographic information sources from all over the world. Attended to all users searching for information and to the librarians for aquiring records in UNIMARC format even though the sources use the MARC21 format. It is a united catalog of 14 libraries and inludes 55.000 bibliographic references. Usual issues of ARGOS are greek history, philology, archaeology, philosophy, religion, and generally the culture of population in the greater area of Balkan and Mediterranean sea since prehistoric years till today. Other usual issues are historical geography, human geography, biographies of historical persons, law, economy and political capitularies.