Amongst his topographical works mention may be made of: Topographie von Aiken (1841); Beschreibung der Ebene von Troja (1850), a commentary on a map of the locality executed by T.
The researches of Helbig (Die Italiker in der Po-Ebene, Leipzig, 1879) show that the lower valley of the Po was at an early period occupied by people of the Palaeolithic and Neolithic stages of civilization, who built houses on piles along the swampy borders of the streams. It is possible that even they may have begun by crude dikes the great system by which the waters are now controlled; at least it is certain that these works date their origin from pre-Roman antiquity.
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