Columbia subject headings:
Harvard subject headings:
Bergisches Land (Germany)--History--20th century--Sources.
Mass murder--Germany--Bergisches Land--History--20th century.
National socialism--Germany--Bergisches Land.
World War, 1939-1945--Atrocities--Germany--Bergisches Land.
Princeton subject headings:
Bergisches Land (Germany)--History--20th century--Sources.
Mass murder--Germany--Bergisches Land--History--20th century.
National socialism--Germany--Bergisches Land.
World War, 1939-1945--Atrocities--Germany--Bergisches Land.