Columbia subject headings:
Harvard subject headings:
Germany (East)--Foreign relations--Germany (West)
Germany (East)--Foreign relations.
Germany (West)--Foreign relations--Germany (East)
Socialism--Germany (East)
Socialism--Germany (West)
Sozialdemokratische Partei Deutschlands
Sozialistische Einheitspartei Deutschlands.
Princeton subject headings:
Socialism--Germany (East)
Socialism--Germany (West)
Sozialdemokratische Partei Deutschlands--History.
Sozialistische Einheitspartei Deutschlands--History.