Columbia subject headings:
Agricultural innovations--Japan--History.
Agriculture--Economic aspects--Japan.
Agriculture--Japan--History.
Rice--Irrigation--Japan--History.
Harvard subject headings:
Agricultural innovations--Japan--History.
Agriculture--Economic aspects--Japan
Agriculture--Japan--History
Rice--Irrigation--Japan--History.
Princeton subject headings:
Agricultural innovations--Japan--History.
Agriculture--Economic aspects--Japan.
Agriculture--Japan--History.
Rice--Japan--Irrigation--History.