sentences:  In 1990, the Library established an exchange agreement with the Belarusian Academy of Sciences Library, Minsk, which allowed it to receive duplicate copies of publications of the 1920s and 1930s - otherwise unobtainable - in exchange for expensive scholar publications from the West.Its holdings were also enriched considerably by systematic search for old and out-of-print publications and by numerous gifts and bequests from various benefactors.Most books were in Belarusian, but with a considerable number of works in other languages, in particular Polish and Russian.