This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Fortifikationsplan von Rapperswil M. L. Kaufflin Stadtmuseum Rapperswil 'Stadt in Sicht Rapperswil in Bildern' P. Das runderneuerte Stadtmuseum in Rapperswil SG und seine Sammlung Fortifikationsplan Rapperswil Plan von Rapperschweil sambt deroselben Ringmglichste und Nothwendigste ForticationsProiecten so geschehen Anno Kaufflin