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.
Robert Koch. Robert Koch Fotogravur nach einer Fotografie von Wilhelm Fechner um Ullstein Bild mic ki se html Creator Wilhelm Fechner reflist PDold Wilhelm Fechner Robert Koch
Page 2023 Free-images.com. All images are Public Domain