Columbia subject headings:
Harvard subject headings:
Germany--Politics and government--1933-1945--Congresses.
International Labour Conference (1931 : Geneva, Switzerland)
Labor--Germany--History--20th century--Congresses.
Leuschner, Wilhelm, 1890-1944--Congresses.
Ley, Robert, 1890-1945--Congresses.
National socialism and labor--Congresses.
Princeton subject headings:
Germany--Politics and government--1933-1945.
Labor--Germany--History--20th century.
Leuschner, Wilhelm, 1890-1944.
Ley, Robert, 1890-1945.
National socialism and labor--Congresses.