Columbia subject headings:
Harvard subject headings:
Inland water transportation--Japan--Employees--History.
Juvenile delinquency--Japan--History.
Juvenile delinquents--Japan--History.
Slave labor--Japan--History.
Princeton subject headings:
Inland water transportation--Japan--Employees--History.
Juvenile delinquency--Japan--History.
Juvenile delinquents--Japan--History.
Slave labor--Japan--History.