Columbia subject headings:
Germany (East)--History--Congresses.
Germany (East)--Politics and government--Congresses.
Sozialistische Einheitspartei Deutschlands--History--Congresses.
Harvard subject headings:
Germany (East)--History--Congresses.
Germany (East)--Politics and government--Congresses.
Sozialistische Einheitspartei Deutschlands--History--Congresses.
Princeton subject headings:
Germany (East)--History.