1 ene 15 año aC - Vitruvius "Architecture"

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"An instance of this may be found in the Gallic marshes surrounding Altinum, Ravenna, Aquileia, and other towns in places of the kind, close by marshes" (Vitruvius, Architecture, 1.4.11)

"There are also numerous other kinds: for instance, in Campania, red and black tufas; in Umbria, Picenum, and Venetia, white tufa which can be cut with a toothed saw, like wood" (Vitruvius, Architecture, 2.7.1)

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