Columbia subject headings:
Bahro, Rudolf, 1935---Congresses.
Communism--Congresses.
Socialism--Congresses.
Harvard subject headings:
Bahro, Rudolf, 1935---Congresses.
Communism--Congresses
Socialism--Congresses
Princeton subject headings:
Bahro, Rudolf, 1935---Congresses.
Communism--Congresses.
Socialism--Congresses.