Today's find at the National Diet Library online: “Ikuta-ryū shinsen sōkyoku-fu” (New selection of Ikuta-ryū koto scores), vol. 1 (1912). By Inoue Kochō (d. 1936?). Takes the standard string-number notation and visualizes it on a 7-line staff. https://t.co/6yJX71P6TL