Public domain
Diagram of Horizontal and Vertical Rhyme at the End of the Zihui: 2 volumes, lower
From the collection of National Diet Library, Japan. Free to download, adapt and use — no permission needed.
Credit line字彙巻末衡直韻図解 : 2巻 下. 享保18(1733). 河野, 通清, 江戸中期. National Diet Library, Japan. Public domain.