Telegraph and Telephone Lines (FY 1920-1929) : Statistical Yearbook of Imperial Japan 50 (1931) Table 153

PERIOD: Japan proper, FY 1920 to FY 1929, Korea, Taiwan, South Sakhalin, Kwantung Province and South Manchurian Railway Zone, FY 1925 to FY 1929. NOTE: (In kilometers). SOURCE: [Reports by the Ministry of Communications]; [Statistics by government offices, overseas territories of Japan].

时期：日本本土，1920财年至1929财年，朝鲜、台湾、南萨哈林、关东省及南满洲铁道区，1925财年至1929财年。注：（单位：公里）。资料来源：[通信省报告]；[政府办公室及日本海外领地的统计数据]。