Despite its name, crystallised in time, the Storage Archives conserve the documentation produced and acquired by the Veneranda Fabbrica during the last two centuries of activity. For this material, Mons. Angelo Ciceri, archivist for the Fabbrica from 1949 to 1972, created a filing system which he integrated as much as possible with the historic structure of the Archive. This resulted in different series which correspond, in varying degrees, to the organisation’s branches of activity. Among these - and fundamental for research - is the Lavori Duomo (Duomo Work) series, which conserves testimony of all the work carried out on the monument since the beginning of the 1800s to today.