Columbia subject headings:
Harvard subject headings:
Labor union members--Germany--Biography.
Labor unions--Germany--Officials and employees--Biography.
Nazi concentration camp inmates--Germany--Correspondence
Osthofen (Concentration camp)
Political prisoners--Germany--Biography
World War, 1939-1945--Concentration camps--Germany--Osthofen.
Princeton subject headings:
Labor unions--Germany.
National socialism.
Osthofen (Concentration camp)
World War, 1939-1945.