Columbia subject headings:
Harvard subject headings:
Bochumer Verein für Bergbau und Gussstahlfabrikation--History.
Concentration camps--Germany--Bochum--History.
Eisen- und Hüttenwerke, Bochum (Concentration camp)--History.
Forced labor--Germany--Bochum--History.
Iron and steel workers--Germany--Bochum--History.
World War, 1939-1945--Concentration camps--Germany--Bochum.
World War, 1939-1945--Prisoners and prisons, German
Princeton subject headings:
Buchenwald (Concentration camp)
Nazi concentration camps--Germany--Bochum.