The democratic changes are having an especially strong effect on making the information exchange more active and continuously expanding both levels and space of the communication. However, growing read of information, development of the telecommunications and information exchange with them. Want of information ties is steadily increasing. The democratic practice of free choice of ideas and information lies at the bottom of these documents, which renders them exceptionally valuable and important in educating scientists, in research and practical activity of library users. That is why their place and significance in the library holdings are getting more firmly established and rising.
Active collaboration requires knowledge of international standards and documents.
In this connection necessity of information on diverse international projects, programs, initiatives is uninterruptedly going up. Both the national library of Budapest and the diet library of Bulgaria render service with official and governmental documents and information. Bulgaria was admitted to the UNO in 1956. Since then St. Cyril and Methodius national library has been discharging functions of the depositary library for the publications of the UNO and of the rest of organizations within its structure. In 1972 the ministerial counsel of Bulgaria imposed by its ordinance upon the national library the duty of building up and maintaining the collection of governmental documents and publications of international organizations.