Jami' al-tawarikh
The lavish illustrations and calligraphy required the efforts of hundreds of scribes and artists, with the intent that two new copies (one in Persian, and one in Arabic) would be created each year and distributed to schools and cities around the Ilkhanate, in the Middle East, Central Asia, Anatolia, and the Indian subcontinent. Approximately 20 illustrated copies were made of the work during Rashid al-Din's lifetime, but only a few portions remain, and the complete text has not survived. The oldest known copy is an Arabic version, of which half has been lost, but one set of pages is currently in the Khalili Collection, comprising 59 folios from the second volume of the work. Another set of pages, with 151 folios from the same volume, is owned by the Edinburgh University Library. Two Persian copies from the first generation of manuscripts survive in the Topkapı Palace Library in Istanbul. The early illustrated manuscripts together represent "one of the most important surviving examples of Ilkhanid art in any medium", and are the largest surviving body of early examples of the Persian miniature.
Archimedes
The foremost document containing the work of Archimedes is the Archimedes Palimpsest. In 1906, the Danish professor Johan Ludvig Heiberg visited Constantinople and examined a 174-page goatskin parchment of prayers written in the 13th century AD. He discovered that it was a palimpsest, a document with text that had been written over an erased older work. Palimpsests were created by scraping the ink from existing works and reusing them, which was a common practice in the Middle Ages as vellum was expensive. The older works in the palimpsest were identified by scholars as 10th century AD copies of previously unknown treatises by Archimedes. The parchment spent hundreds of years in a monastery library in Constantinople before being sold to a private collector in the 1920s. On October 29, 1998 it was sold at auction to an anonymous buyer for $2 million at Christie's in New York. The palimpsest holds seven treatises, including the only surviving copy of "On Floating Bodies" in the original Greek. It is the only known source of "The Method of Mechanical Theorems", referred to by Suidas and thought to have been lost forever. "Stomachion" was also discovered in the palimpsest, with a more complete analysis of the puzzle than had been found in previous texts. The palimpsest is now stored at the Walters Art Museum in Baltimore, Maryland, where it has been subjected to a range of modern tests including the use of ultraviolet and light to read the overwritten text.