In France, as indeed in the whole world, numerous programs or initiatives have been launched during the last ten odd years to digitize ancient collections of manuscripts and early printed books. Most have been undertaken by libraries, as in the well-known case of Gallica, in the Bibliothèque nationale de France, usually with the help of public entities, be them local governments or ministries, others by research centers, in the Centre national de la recherché scientifique or in universities, some by individual scholars. What can historians of the book do with this abundant and very diverse material? A symposium organized in Lyon by ENSSIB in the winter of 1999 – Pour une nouvelle erudition. La numérisation au service de l'histoire du livre ...