Columbia subject headings:
Harvard subject headings:
Agriculture, Cooperative--Europe, Central--History--19th century.
Agriculture, Cooperative--Europe, Central--History--20th century.
Agriculture, Cooperative--Europe, Southern--History--19th century.
Agriculture, Cooperative--Europe, Southern--History--20th century.
Princeton subject headings:
Agriculture, Cooperative--Europe, Central--History--19th century.
Agriculture, Cooperative--Europe, Central--History--20th century.
Agriculture, Cooperative--Europe, Southern--History--19th century.
Agriculture, Cooperative--Europe, Southern--History--20th century.