Columbia subject headings:
Agriculture--Economic aspects--England--History--20th century.
Agriculture--Economic aspects--Wales--History--20th century.
England--Rural conditions.
Wales--Rural conditions.
Harvard subject headings:
Agriculture--Economic aspects--England--History--20th century.
Agriculture--Economic aspects--Wales--History--20th century.
England--Rural conditions.
Wales--Rural conditions.
Princeton subject headings:
Agriculture--Economic aspects--England--History--20th century.
Agriculture--Economic aspects--Wales--History--20th century.
England--Rural conditions.
Wales--Rural conditions.