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.
Adolph Steen by I.W. Tegner. Adolph Steen Danish mathematician and politician MP myerichsen net html Danish Royal Library Tegner PDold Adolph Steen Lithographs by Tegner Kittendorff Files from The Portrait Collection of the Danish Royal Library
Page 2023 Free-images.com. All images are Public Domain