Columbia subject headings:
Harvard subject headings:
Agricultural innovations--England--History--18th century.
Agricultural innovations--Germany--Hannover (Province)--History--18th century.
Agricultural innovations--Germany--Hanover (Province)--History--18th century.
Agriculture--England--History--18th century.
Agriculture--Germany--Hannover (Province)--History--18th century.
Agriculture--Germany--Hanover (Province)--History--18th century.
Princeton subject headings:
Agricultural innovations--England--History--18th century.
Agricultural innovations--Germany, West--Hanover (Province, etc.)--History--18th century.
Agriculture--England--History--18th century.
Agriculture--Germany, West--Hanover (Province, etc.)--History--18th century.