The manuscript De Revolutionibus by Nicolaus Copernicus is the most valuable manuscript in Poland, dating from 1515–1540. Later, it found its way to the Nostitz Library, where in 1774 it received an ex libris. It has 213 cards (426 pages). Currently, it is stored in the collection of the Jagiellonian Library under reference number 10,000. In 1999, it was entered on the UNESCO Memory of the World list.