Columbia subject headings:
Harvard subject headings:
Menstruation--Social aspects--Japan--History--20th century.
Nihon Denshin Denwa Kōsha--Personnel management--History--20th century.
Sick leave--Japan--History--20th century.
Women--Employment--Japan--History--20th century.
Princeton subject headings:
Menstruation--Social aspects--Japan--History--20th century.
Nihon Denshin Denwa Kōsha--Personnel management--History--20th century.
Sick leave--Japan--History--20th century.
Women--Employment--Japan--History--20th century.