Columbia subject headings:
Agriculture and state--Great Britain--History--20th century.
Agriculture--Economic aspects--Great Britain--History--20th century.
Harvard subject headings:
Agriculture and state--Great Britain--History--20th century.
Agriculture--Economic aspects--Great Britain--History--20th century.
Princeton subject headings:
Agriculture and state--Great Britain--History--20th century.
Agriculture--Economic aspects--Great Britain--History--20th century.