Columbia subject headings:
Harvard subject headings:
Salt industry and trade--Germany (East)--History.
Salt industry and trade.
Salt mines and mining--Germany (East)--History.
Princeton subject headings:
Salt industry and trade--Germany (East)--Thuringia--History.
Salt industry and trade--Saxony--History.
Salt mines and mining--Saxony--History.
Salt mines and minng--Germany (East)--Thuringia--History.