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.
Witt Vijf Lessen. Het Esperanto in vijf lessen self scanned Antoon Jozef Witteryck This image is in the public domain due to its age PDold History of Esperanto documents Book covers in Esperanto books