Columbia subject headings:
Economic forecasting--Congresses.
Economists--Soviet Union--Biography--Congresses.
Kondratʹev, N. D. (Nikolaĭ Dmitrievich), 1892-1938--Congresses.
Long waves (Economics)--Congresses.
Harvard subject headings:
Princeton subject headings:
Economics--Soviet Union--Congresses.
Economists--Soviet Union--Biography--Congresses.
Kondratʹev, N. D. (Nikolaĭ Dmitrievich), 1892-1938--Congresses.