Columbia subject headings:
Collective labor agreements--France--History--19th century.
Collective labor agreements--France--History--20th century.
Collective labor agreements--Germany--History--19th century.
Collective labor agreements--Germany--History--20th century.
Harvard subject headings:
Collective labor agreements--France--History--19th century.
Collective labor agreements--France--History--20th century.
Collective labor agreements--Germany--History--19th century.
Collective labor agreements--Germany--History--20th century.
Princeton subject headings:
Collective labor agreements--France--History--19th century.
Collective labor agreements--France--History--20th century.
Collective labor agreements--Germany--History--19th century.
Collective labor agreements--Germany--History--20th century.