Heisei 2-nen kokusei chōsa hōkoku. Bekkan. Waga kuni ni jinkō shūchū chiku = 1990 population census of Japan special volume. Densely inhabited districts
Shōwa 60-nen kokusei chōsa hōkoku. Bekkan. Waga kuni no jinkō shūchū chiku = 1985 population census of Japan. Special volume. Densely inhabited districts