Columbia subject headings:
Germany (West)--Politics and government--Congresses.
Germany (West)--Social conditions--Congresses.
Sozialdemokratische Partei Deutschlands--Congresses.
Working class--Germany (West)--Congresses.
Harvard subject headings:
Germany (West)--Politics and government--Congresses.
Germany (West)--Social conditions--Congresses.
Sozialdemokratische Partei Deutschlands--Congresses.
Working class--Germany (West)--Congresses.
Princeton subject headings:
Germany (West)--Politics and government--Congresses.
Germany (West)--Social conditions--Congresses.
Sozialdemokratische Partei Deutschlands--Congresses.
Working class--Germany (West)--Congresses.