Columbia subject headings:
Harvard subject headings:
Industries--Germany--Wilhelmshaven--History--20th century.
Industries--Germany--Wolfsburg (Lower Saxony)--History--20th century.
Wilhelmshaven (Germany)--Economic conditions--20th century.
Wolfsburg (Lower Saxony, Germany)--Economic conditions--20th century.
Princeton subject headings:
Industries--Germany--Wilhelmshaven--History--20th century.
Industries--Germany--Wolfsburg (Lower Saxony)--History--20th century.
Wilhelmshaven (Germany)--Economic conditions--20th century.
Wolfsburg (Lower Saxony, Germany)--Economic conditions--20th century.