The author died in 1932, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 80 years or fewer.
{{Reliefs of Trajans Column |description = {{de|Bau von Festungswerken (Szene LXV); Große Schlacht (Szene LXVI): Römische ''carroballista''}} {{en|Building fortifications (Scene LXV); A major engagement (Scene LXVI): Roman ''carroballista''}} |plate
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