Columbia subject headings:
National socialism.
Troisdorf (Germany)--History.
World War, 1939-1945--Germany--Troisdorf.
Harvard subject headings:
National socialism.
Troisdorf (Germany)--History.
World War, 1939-1945--Germany--Troisdorf.
Princeton subject headings:
National socialism.
Troisdorf (Germany)--History.
World War, 1939-1945--Germany (West)--Troisdorf.