In this article is told about book collection of doctor of medicine of Terentiy Ivan Vyazemskiy, which is one of not many private collections of pre-revolution Russia, saved to our time. Further direction of works is complete completion of digitizing of its editions, input of editions in the GreenStone program, forming of electronic catalogue of fund in IRBIS, complete restoration of the most ... [Show full abstract] damaged part of fund, grant of access to electronic editions and electronic catalogue over the Internet. Book collection of doctor of medicine of Terentiy Ivan Vyazemskiy (1857-1914) is one of not many private collections of pre-revolution Russia, saved to our time. By evaluation of contemporaries, this was one of the best private libraries of Russia. It is the largest collection counting 35 thousand books in Ukraine, from them more than half -in foreign languages. From 1907 books are being kept in created T. Vyazemskiy in Crimea -Karadag scientific station (a modern legal successor is the Karadag natural reserve). Doctor and writer S. Y. Elpatievskiy, after the visit in 1911 -1912 the Vyazemskiy estate, in the "Crimean essays" (Moscow, 1913) so describes a library like that "...there are editions which were searched Т.Vyazemskiy at second-hand booksellers all over Europe; there are editions, which cost 20 thousand of francs for one edition. There is a complete collection of memoirs of the London academy of sciences from 1666, from the day of foundation...; the same collection of labours of the French academy of sciences, also from XVII century, also hundred volumes too; there are editions which are only in a Florentine public library... How much does this library cost -one hundred thousand, two hundred thousand, perhaps, more, I do not know; but I never heard about a private library in Russia, such as this library which was going with such great love..." (Elpatievskiy, 1913).