Fig. 1

Positions of the archaeological sites where the glass samples were found. The map outlines the present-day administrative regions in Italy. The sites are the following: 1 – Vulci; 2 – Cerveteri; 3 – Veio; 4 – Capena; 5 – Terni; 6 – Osteria dell’Osa; 7 – Marino; 8 – Sermoneta; 9 – Verucchio