The working Community of Libraries and Centers of Documentation for research of Eastern, Middle and South East Europe (ABDOS) was founded in 1971, as an informal Association of Directors of German libraries and Institutions, which was engaged in research of Eastern, Middle and South East Europe. The Goal of its foundation was to accelerate the sharing of information between Institutions that are collecting, handling and giving for usage the literature from Eastern Europe, as well as literature about Eastern Europe. Until today, thirty ABDOS Sessions were held. From small meetings, in the beginning, held in Germany, ABDOS turned into renowned Iinternational Association (this year it will be institutionalized). From 1990. Sessions take the rank of Conference, with the participation of Librarians from America and Canada. Since 1984. discussions from Sessions were published in the Codes in the frame of the Collection "Staatsbibliothek zu Berlin – PreuLischer Kulturbesitz – Vergffentlichungen der Osteuropa-Abteilung". The Editorial department of ABDOS regularly publishes the Informative Bulletin "Mitteilungen", within Information about changes in Libraries, which are members of ABDOS, and an important part in this bulletin is dedicated to preparations for annual Meetings.