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19.8.01 The distribution of quarry areas across Insulae VIII.7 and I.1
19.8.02 Evidence of wedging and fracture of the lava in Quarry Area 14 in Rooms 126 and 127 of I.1.6–9; viewed from the west. Note also the masonry platform for a lifting device
19.8.03 Number of events of quarrying for lava stone (black) and Mercato ash (gray) per phase