Vehicles (Dec. 31, 1931) : Statistical Yearbook of Imperial Japan 52 (1933) Table 168

PERIOD: the end of each FY 1922 to FY 1929. 1930 year-end to 1931 year-end. By region at the end of FY 1931. SOURCE: [Police Statistical Report; Statistics by government offices, overseas territories of Japan].

时期：1922至1929年度的年终至1930年度年终至1931年度年终。截至1931年度年终的地区划分。来源：[警察统计报告；日本海外领土政府机构统计]。