Columbia subject headings:
Bukharin, Nikolaĭ, 1888-1938--Congresses.
Communism--Soviet Union--History--Congresses.
Soviet Union--Politics and government--Congresses.
Harvard subject headings:
Bukharin, Nikolaĭ, 1888-1938--Congresses.
Communism--Soviet Union--History--Congresses.
Soviet Union--Politics and government--Congresses.
Princeton subject headings:
Bukharin, Nikolaĭ, 1888-1938--Congresses.
Communism--Soviet Union--History--Congresses.
Soviet Union--Politics and government--Congresses.