Columbia subject headings:
Harvard subject headings:
Cooperative societies--Germany--Westphalia--History--19th century.
Cooperative societies--Germany--Westphalia--History--20th century.
Westphalia (Germany)--Economic conditions--19th century.
Westphalia (Germany)--Economic conditions--20th century.
Princeton subject headings:
Cooperative societies--Germany--Westphalia--History--19th century.
Cooperative societies--Germany--Westphalia--History--20th century.
Westphalia (Germany)--Economic conditions--19th century.
Westphalia (Germany)--Economic conditions--20th century.