Columbia subject headings:
Harvard subject headings:
Capitalism--Social aspects--Germany (East)--Congresses.
Marxian economics--Congresses.
Socialism--Congresses
Socialism--Economic aspects--Germany (East)--Congresses.
Socialism--Forecasting--Congresses.
Twenty-first century--Forecasts--Congresses.
Princeton subject headings:
Marxian economics--Congresses.
Socialism--Congresses.