Columbia subject headings:
Agricultural innovations--England--History.
Agriculture--England--History.
Animal traction--England--History.
Draft horses--England--History.
Oxen--England--History.
Harvard subject headings:
Agriculture--England--History
Draft horses--England--History.
Princeton subject headings:
Agricultural innovations--England--History.
Agriculture--England--History.
Animal traction--England--History.
Draft horses--England--History.
Oxen--England--History.