Columbia subject headings:
Communism--Germany (East)
Opposition (Political science)
Sozialistische Einheitspartei Deutschlands.
Harvard subject headings:
Communism--Germany (East)
Opposition (Political science)--Germany (East)
Sozialistische Einheitspartei Deutschlands.
Princeton subject headings:
Communism--Germany (East)
Opposition (Political science)
Sozialistische Einheitspartei Deutschlands.