Pianta di Roma con l’indicazione dei rioni, dei principali monumenti e dell’flood del dicembre 1870. In colore verde sono indicate le aree inondate. In numeri neri sono indicate le altezze in misura metrica riferite al piano stradale. I numeri in colore azzurro indicano le stesse altezze riferite al livello del mare. In basso compaiono le scale in metri e palmi romani.

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