Principal Workers, Dependents without a Principal Occupation, and Domestic Servants by Principal Workers’ Occupation (Medium Classification) (Population census on Oct. 1, 1920 ) : Statistical Yearbook of Imperial Japan 52 (1933) Table 14

PERIOD: Population census on Oct. 1, 1920 . SOURCE: [Survey by the Statistics Bureau, Imperial Cabinet].

时期：1920年10月1日的人口普查。来源：[帝国内阁统计局调查]。