found: Yamakoshi sonshi. Minzoku, 1983:t.p. (Yamakoshi-mura) colophon (Niigata-ken Koshi-gun Yamakoshi-mura)
found: Zenkoku shichōson, 1981:p. 174 (Yamakoshi-mura; 1956, Tanesuhara mura [no publs. in LC data base], Ōta-mura [no publs. in LC data base], Takezawa-mura [no publs. in LC data base] and Higashitakezawa-mura [no publs. in LC data base] merged to form Yamakoshi-mura)
found: Nihon bunken chizu, 1983(Yamakoshi-mura; Niigata-ken Koshi-gun)
found: GeoNames, algorithmically matched, 2009(adm3; 37°20ʹ00ʺN 138°55ʹ00ʺE)