Columbia subject headings:
Harvard subject headings:
Automobile industry and trade--Germany--History--20th century--Congresses.
Forced labor--Germany--History--20th century--Congresses.
Porsche A.G.--History--Congresses.
Porsche, Ferdinand, 1875-1951--Congresses.
Volkswagenwerk--History--Congresses.
Princeton subject headings:
Automobile industry and trade--20th century--Moral and ethical aspects--Germany--Congresses.
Automobile industry and trade--Germany--Wolfsburg (Lower Saxony)--History--20th century--Congresses.
Forced labor--Germany--Wolfsburg (Lower Saxony)--History--20th century--Congresses.
National socialism and labor--Germany--Wolfsburg (Lower Saxony)--History--Congresses.
Porsche A.G.--History--Congresses.
Porsche, Ferdinand, 1875-1951--Congresses.
Volkswagenwerk--Anniversaries, etc.--Congresses.
Volkswagenwerk--History--Congresses.