Me I would be most grateful for including material on the medieval superbridge at Trezzo sullAdda Why Because this bridge must have been amazing as it doubled the longest span of stone bridges then from  to  Still the briidge is almost unknown as nobody covers the subject   There is also a claim that the Etruscans build very early on stone arch bridges earlier than both Greeks and Romans Two of them are included in Structurae but I am not sure whether these are still the original structures Including the Etruscans in a comprehensive history of stone arch bridges would definitely be an almost revolutionary thing  For the timeline see also  Trajans Bridge  longest span for a  years  Ponte Santa Trinit  first elliptical arch bridge  Steinerne Brcke in Regensburg Germany  model for many medieval bridges to come  Pont SaintBnezet  IMHO this bridge could be the first segmental arch bridge in Europe What we need is the spanriseratio Regards