Columbia subject headings:
Agriculture--Economic aspects--England--History--18th century.
Agriculture--Economic aspects--Wales--History--18th century.
Capitalism--England--History--18th century.
Capitalism--Wales--History--18th century.
Grain trade--England--History--18th century.
Grain trade--Wales--History--18th century.
Harvard subject headings:
Agriculture--Economic aspects--England--History--18th century.
Agriculture--Economic aspects--Wales--History--18th century.
Capitalism--England--History--18th century.
Capitalism--Wales--History--18th century.
Grain trade--England--History--18th century.
Grain trade--Wales--History--18th century.
Princeton subject headings:
Agriculture--Economic aspects--England--History--18th century.
Agriculture--Economic aspects--Wales--History--18th century.
Capitalism--England--History--18th century.
Capitalism--Wales--History--18th century.
Grain trade--England--History--18th century.
Grain trade--Wales--History--18th century.