Public domain
Diagram of the Eighteen Enclosures and an additional Diagram of the Osaka Kyūshō-in Enclosure [6] [6]: Today-an Enclosure Drawing, by Sen Sōsa (Retired), held at Sōken's residence (Size: 30.7×42.5cm)
From the collection of National Diet Library, Japan. Free to download, adapt and use — no permission needed.
Credit line十八圍之圖外ニ大阪九昌院圍之圖一枚 [6] [6]: 今日庵圍繪圖 千宗左隠居 宗乾宅有之 (大きさ:30.7×42.5cm). 文政7 [1824]. National Diet Library, Japan. Public domain.