Columbia subject headings:
Harvard subject headings:
Concentration camp inmates--Germany--Rhein-Erft-Kreis--History.
Concentration camps--Germany--Rhein-Erft-Kreis--History.
National socialism--Germany--Rhein-Erft-Kreis.
Political atrocities--Germany--Rhein-Erft-Kreis--History--20th century.
Prisoners--Germany--Rhein-Erft-Kreis--History.
Rhein-Erft-Kreis (Germany)--History.
Princeton subject headings:
Jews--Persecutions--Germany--Rhein-Erft-Kreis.
National socialism--Germany--Rhein-Erft-Kreis.
Political persecution--Germany--Rhein-Erft-Kreis.
Rhein-Erft-Kreis (Germany)--Politics and government.