Approximately 20,000 pages of manuscripts by Farkas and János Bolyai are among the library's most prized pieces. Other important manuscripts are: the diaries of Mihály Cserei, General Mihály Teleki the younger, Ferenc Nagy Szabó, Mayor of Marosvásárhely, some of Péter Bod’s works (in original or copies), Sámuel Teleki’s correspondence and official documents.