Gas (FY 1929) : Statistical Yearbook of Imperial Japan 50 (1931) Table 91

PERIOD: End of each FY 1920 to FY 1929. By region at the end of FY 1929. SOURCE: [Statistical Abstract of Gas Enterprises in Japan; Statistics by government offices, overseas territories of Japan].

时期：1920财年至1929财年年末。按地区划分，以1929财年年末为基准。来源：[《日本燃气企业统计摘要》；日本政府机构及海外领地统计]。