Columbia subject headings:
Harvard subject headings:
Elections--Germany--Schleswig-Holstein.
Flensburg Region (Germany)--Politics and government.
Labor movement--Germany--Schleswig-Holstein.
Schleswig-Holstein (Germany)--Politics and government.
Socialism--Germany--Flensburg Region--History.
Socialism--Germany--Flensburg Region.
Sozialdemokratische Partei Deutschlands--History.
Princeton subject headings:
Socialism--Germany--Flensburg Region--History.
Sozialdemokratische Partei Deutschlands--History.