T LIBRARY of Duke Frederigo of Montefeltre, Count of Urbino, (14441482 A.D.) was described by his librarian and biographer Vespasiano1 as containing one perfect copy of every known work at that time, sacred or profane, in the original tongue or in translation. The duties of the librarian were clearly stated in a code issued under Guidobaldo I, son of Frederigo:2 He must be not only learned but ...