A Study on the the Documents of Ichihara Famiry Called 'Gotsuko-Ikkan' Vol.2 in 1867. Annals of the Association of Kumamoto Geographers. 2003. 14, 24-40
Historical Geographical Study on Harima Sanyo-do in the Edo Era.-the status Quo of early modern Sanyo-do and General View about the Post Towns-. Research Reports of kumamoto National College of Technology. 2000. 27. 29-58
Historical Geographical Study on Sanyo-do in Okayama-han(clan)in the Edo Era. -the Statous Quo of Bizen Sanyo-do and the General View about the Stage Touns-. Research Reports of Kumamoto National College of Technology. 1999. 26. 85-112