found: Int'l Conf. on Scan. Tunnel. Microscopy/Spectroscopy (4th : 1989 : Ōarai-machi, Japan). Proceedings of the Fourth International Conference on ... 1990:t.p. (Ōarai, Ibaraki, Japan)
found: Ibaraki-ken daihyakka j.(Ōarai-machi; in 1944, Isohama-machi [no publs. in LC database] and Ōnuki-machi [no publs. in LC database] merged to form Ōarai-machi; in 1955, absorbed a part of Asahi-mura [no publs. in LC database])
found: Zenkoku shichōson, 1984(Ibaraki-ken/Higashiibaraki-gun/Ōarai-machi)
notfound: Kokudo gyōsei kukaku, 1951.
found: GeoNames, algorithmically matched, 2009(civil; 36°18ʹ00ʺN 140°33ʹ00ʺE)
