Columbia subject headings:
Harvard subject headings:
Ashio Copper Mines.
Ashio-machi (Japan)--History.
Copper miners--Japan--Ashio-machi--History.
Labor disputes--Japan--Ashio-machi.
Princeton subject headings:
Copper miners--Japan--Ashio-shi--History.
Industrial relations--Japan--History.
Labor disputes--Japan--Ashio-shi--History.