In particular the site contains:
1. Some of the great books in science, including books by Galileo, Newton, Copernicus, Kepler, Einstein, Darwin and others.
2. Most of the Shakespeare Quartos from the British Library, the Bodleian Library, the Edinburgh Library, and the National Library of Scotland. It also contains the First Folio from the Folger Library.
3. The Library of Congress ’ copies of Poor Richard ’s Almanac by Benjiman Franklin.
4. Very rare editions: Gutenberg ’s Bible of 1455, Harvey's book on the circulation of blood, Galileo ’s Siderius Nuncius, the first printing of the Bill of Rights, and the Magna Carta.