Columbia subject headings:
Harvard subject headings:
Brandenburg (Germany : State)--Economic conditions--Congresses.
Industries--Social aspects--Germany--Brandenburg--Congresses.
Industries--Social aspects--Germany--Lusatia--Congresses.
Industries--Social aspects--Germany--Saxony--Congresses.
Lusatia (Germany)--Economic conditions--Congresses.
Saxony (Germany)--Economic conditions--Congresses.
Princeton subject headings:
Brandenburg (Germany : State)--Economic conditions.
Saxony (Germany)--Economic conditions.