these are the central scientific library and the national library. has two institutions in the country , this is the obligatory copy. uh, also we we acquire. uh, a publication on a certain scientific topic, that is , funds are allocated, and we acquire, both in belarus and foreign literature, including this scientific work there. we will purchase either this book, but this one will not. well look there are large scientific centers. uh, academic the same russian academic chat institute university science, both in our country and abroad, where? well , literature comes out periodically, both periodically scientific journals with research articles, and monographs. basically, this is all literature, one of which is purchased, but there is also one more. uh, well, the way is donation, that is, people donate books, for example, also archives, for example, here are scientists. he worked all his life scientists will always be big. personally, a library at home and a large archival heritage, that is, some manuscripts, outlines of articles, and so on. well, we