Many books bear the super ex-libris of the former owners.
P.K. Aleksandrov had inherited both collections from his father Grand-Duke Konstantin Pavlovich. P.K. Aleksandrov donated the bulk of his collection to Helsinki University. Together with the polyglot editions of Our Lord's Prayer the collection includes documents in more than 100 languages. Borrowing rules of the Library of the Humanities are applied to the collection. The collection was bequeathed to Tartu University Library in 1821.