Columbia subject headings:
Forced labor--Germany--Offenbach am Main--20th century.
Offenbach am Main (Germany)--Economic conditions.
Working class--Germany--Offenbach am Main--History--20th century.
World War, 1939-1945--Conscript labor--Germany.
Harvard subject headings:
Frankfurt am Main (Germany)--History
Offenbach am Main (Germany)--History.
Working class--Germany--Frankfurt am Main--History--20th century.
Working class--Germany--Offenbach am Main--History--20th century.
World War, 1939-1945--Germany--Frankfurt am Main.
World War, 1939-1945--Germany--Offenbach am Main.
Princeton subject headings: