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:
CHNB Naturstudie eines Bergbaches Collection Gugelmann GSGUGERIETERHB.tif Information Creator Heinrich Rieter der ltere Naturstudie eines Bergbaches schwarze und weisse Kreide auf blauem Papier Swiss National Library CHNBCollection Gugelmann PDold User Swiss National Library GSGUGERIETERHB helveticarchives ch aspx ID helveticarchives