File:Tann-Rüti - Römisch-Katholische Kirche 2011-01-17 13-50-54.JPG - Wikimedia Commons
PDF) A sustainable frontier? The establishment of the Roman frontier in the Rhine delta. Part 1: From the end of the Iron Age to the death of Tiberius (c. 50 BC-AD 37) [
File:Reconstructed plan of the Roman city of Colonia Claudia Ara Agrippinensium (Cologne) after AD 50, Romisch-Germanisches Museum, Cologne (8115594841).jpg - Wikimedia Commons