Columbia subject headings:
Harvard subject headings:
Bytomskie Zjednoczenie Przemysłu Węglowego--History.
Coal trade--Poland--Bytom--History--20th century.
Concentration camps--Poland--Bytom--Registers.
Forced labor--Poland--Bytom--Registers.
Germans--Poland--History--20th century
Princeton subject headings:
Bytomskie Zjednoczenie Przemysłu Węglowego--History.
Coal trade--Poland--Bytom--History--20th century.
Forced labor--Poland--Bytom--Registers.
Germans--Poland--History--20th century.
Internment camps--Poland--Bytom--Registers.