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There is however a mass of data in the Tiber Valley survey archives and in published material (Forma Italiae etc.) which can be used to ground this analysis in the archaeology. However likely this is, until now it has remained largely an assumption, supported in part by literary sources which relate more to the south and east of Rome (Tibur etc.) than to the Tiber Valley to the north and by theoretical models. It seems clear that the proximity of Rome encouraged settlement here, and it is frequently assumed that farms and villas in this area were engaged in growing fruit and vegetables to serve the markets of Rome (Potter, Changing Landscape Morley, Metropolis and Hinterland). The South Etruria survey results indicated a much denser concentration of settlement in the southern part of the survey area, closer to Rome.
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