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.
Keywords from Image Description:
AMHNA Floor plan of fort Oostenburg. Artwork nl Plattegrond van fort Oostenburg nl Titel catalogus Leupe NA Plan d'Oostenburg relatif au projet de mr Reimer Notities verso Plan d'Ostinbourg Relatif au Projet de Mr Reimer No in potlood onder het andere getal geschreven en Title in the Leupe catalogue National Archives Plan