Columbia subject headings:
Harvard subject headings:
Industries--Germany--Kassel--History--20th century.
Kassel (Germany)--Economic conditions--20th century.
Labor market--Germany--Kassel--History--20th century.
Labor--Germany--Kassel--History--20th century.
Social structure--Germany--Kassel--History--20th century.
Princeton subject headings:
Industries--Germany--Kassel--History--20th century.
Kassel (Germany)--Economic conditions--20th century.
Labor market--Germany--Kassel--History--20th century.
Labor--Germany--Kassel--History--20th century.
Social structure--Germany--Kassel--History--20th century.