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.
Signature of Johannes Hassenpflug. Signature of Johannes Hassenpflug gwdg de by Johannes Hassenpflug Ineligible for copyright but in the Public Domain due to age anyway PDold Hassenpflug family
Page 2023 Free-images.com. All images are Public Domain