Columbia subject headings:
Harvard subject headings:
Ashio-machi (Japan)--Social conditions.
Copper industry and trade--Japan--Ashio-machi.
Copper mines and mining--Japan--Ashio-machi.
Princeton subject headings:
Ashio-machi (Japan)--Social conditions.
Copper industry and trade--Japan--Ashio-machi.
Copper mines and mining--Japan--Ashio-machi.