Columbia subject headings:
Harvard subject headings:
Direct democracy--Germany--Saarland--History--20th century.
Political campaigns--Germany--Saarland--History--20th century.
Referendum--Germany--Saarland--History--20th century.
Saarland (Germany)--Politics and government--20th century.
Princeton subject headings:
Direct democracy--Germany--Saarland--History--20th century.
Referendum--Germany--Saarland--20th century.
Saarland (Germany)--Politics and government--20th century.