Columbia subject headings:
Harvard subject headings:
Forced labor--Germany--History--19th century--Congresses.
Forced labor--Germany--History--20th century--Congresses.
Minorities--Germany--History--19th century--Congresses.
Minorities--Germany--History--20th century--Congresses.
Work--History--19th century--Congresses.
Work--History--20th century--Congresses.
Princeton subject headings:
Forced labor--Germany--History--19th century--Congresses.
Forced labor--Germany--History--20th century--Congresses.
Minorities--Germany--History--19th century--Congresses.
Minorities--Germany--History--20th century--Congresses.
Work--History--19th century--Congresses.
Work--History--20th century--Congresses.