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.
CoursCompletDeVolapkPage . Scans of the xerox copy of thcentury Volapk course in French original xerox pages Auguste Kerckhoffs PDold Cours Complet de Volapk
Page 2023 Free-images.com. All images are Public Domain