Columbia subject headings:
Forced labor--Germany--Rhineland-Palatinate--History--20th century.
World War, 1939-1945--Germany--Rhineland-Palatinate.
Harvard subject headings:
Forced labor--Germany--Rhineland-Palatinate--History--20th century.
Forced labor--Germany--Rhineland-Palatinate--History.
World War, 1939-1945--Germany--Rhineland-Palatinate.
Princeton subject headings:
Forced labor--Germany--Rhineland-Palatinate--History--20th century.
World War, 1939-1945--Germany--Rhineland-Palatinate.