Columbia subject headings:
Harvard subject headings:
Irrigation engineering--Japan--Aka River Watershed--History.
Irrigation--Japan--Aka River Watershed--History.
Japan--History--Tokugawa period, 1600-1868.
Water resources development--Japan--Aka River Watershed--History.
Princeton subject headings:
Irrigation farming--Japan--Aka River Basin--History.
Irrigation--Japan--Aka River Basin--History.