Columbia subject headings:
Harvard subject headings:
Economic development--Germany--Thuringia--History--Case studies--Congresses.
Industrialization--Germany--Thuringia--History--Congresses.
Industries--Germany--Thuringia--History--Congresses.
Social change--Germany--Thuringia--History--Congresses.
Thuringia (Germany)--Economic conditions--Congresses.
Princeton subject headings:
Economic development--Germany--Thuringia--History--Case studies--Congresses.
Industrialization--Germany--Thuringia--History--Congresses.
Industries--Germany--Thuringia--History--Congresses.
Social change--Germany--Thuringia--History--Congresses.
Thuringia (Germany)--Economic conditions--Congresses.