Columbia subject headings:
Harvard subject headings:
Charcoal burners--Germany--Harz Mountains--History.
Charcoal industry--Germany--Harz Mountains--History.
Charcoal--Germany--Harz Mountains--History.
Princeton subject headings:
Charcoal burners--Germany--Harz Mountains--History.
Charcoal industry--Germany--Harz Mountains--History.
Charcoal--Germany--Harz Mountains--History.