Columbia subject headings:
Forecasting--History--19th century.
Forecasting--History--20th century.
Germany--Intellectual life.
Utopias.
Harvard subject headings:
Forecasting--History--19th century.
Forecasting--History--20th century.
Germany--Intellectual life--19th century.
Germany--Intellectual life--20th century.
Germany--Intellectual life.
Utopias--Germany.
Utopias--History--19th century
Utopias--History--20th century
Utopias.
Princeton subject headings:
History--Philosophy.
Social prediction.