Books, e-books, journals, periodicals, proceedings, standards and loaning procedures will be migrated on 21st of April to a new website under development. See here for more information.
The "Books" collection contains all books (monographs, but not conference proceedings) in the collections of the CERN Central (Main) and satellite libraries. This means all books which have been added to the collections since 1954. The books themselves can of course be much older.