Public domain
[Materials from the Astrological Bureau: The Shibukawa Family] [A-017] Formulas for Arithmetic Problems
From the collection of National Diet Library, Japan. Free to download, adapt and use — no permission needed.
Subjects
Credit line[天文方渋川家関係資料] [A-017] 筆算書四則問題之式. [江戸前期-昭和前期] [写]. National Diet Library, Japan. Public domain.