Columbia subject headings:
Business forecasting--Germany--Congresses.
Economic forecasting--Germany--Congresses.
Germany--Forecasting--Congresses.
Social prediction--Germany--Congresses.
Harvard subject headings:
Business forecasting--Germany--Congresses.
Economic forecasting--Germany--Congresses.
Germany--Forecasting--Congresses.
Social prediction--Germany--Congresses.
Princeton subject headings: