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Books about Tokunai:
ACTA Sieboldiana / Ein Nachgelassenes Manuskript PH. F. Von Siebolds Zu 'Nippon' Abteilung VII: Das Mogami Tokunai... by Hans A. Dettmer and Viktoria Eschbach-Szabo (Dec 31, 2002)
Wiki information Tokunai:
Mogami Tokunai was a Japanese samurai, geographer and explorer. Mogami was born in Dewa Province which is now part of Yamagata Prefecture. He explored and mapped Hokkaido and Sakhalin and some of the Kuril Islands in 1785–1786. In his reports to the...
19707 Tokunai is a main-belt asteroid discovered on October 8, 1999 by T. Okuni at Nanyo.