The Archimedes Palimpsest is a parchment codex palimpsest (Wikipedia page ), which originally was a 10th-century Byzantine copy of an otherwise unknown work of Archimedes of Syracuse and other authors. It was overwritten with Christian religious text by 13th-century monks. The manuscript currently belongs to an American private collector.
The transcriptions of the book were digitally encoded using the Text Encoding Initiative guidelines, and metadata for the images and transcriptions included identification and cataloging information based on Dublin Core Metadata Elements. The metadata and data were managed by Doug Emery of Emery IT.
On October 29, 2008, (the tenth anniversary of the purchase of the palimpsest at auction) all data, including images and transcriptions, were hosted on the Digital Palimpsest Web Page for free use under a Creative Commons License, and processed images of the palimpsest in original page order were posted as a Google Book. In late 2011, it was the subject of the Walters Art Museum exhibit "Lost and Found: The Secrets of Archimedes". In 2015, in an experiment into the preservation of digital data, Swiss scientists encoded text from the Archimedes Palimpsest into DNA
More information, including the history and analysis of the document, on the Wikipedia page 
The Nova project page, with a timeline of the manuscript, is