Columbia subject headings:
Harvard subject headings:
Collective bargaining--Japan--History.
Labor unions--Merchant mariners--Japan--History.
Merchant marine--Government policy--Japan--History.
Merchant mariners--Legal status, laws, etc.--Japan--History.
Princeton subject headings:
Collective bargaining--Japan--History.
Labor unions--Merchant mariners--Japan--History.
Merchant marine--Government policy--Japan--History.
Merchant mariners--Legal status, laws, etc.--Japan--History.