Columbia subject headings:
China--History--Ming dynasty, 1368-1644.
China--History--Qing dynasty, 1644-1912.
Drinking water--China--Loess Plateau--History.
Water-supply--China--Loess Plateau--History.
Harvard subject headings:
China--History--Ming dynasty, 1368-1644
China--History--Qing dynasty, 1644-1912
Drinking water--China--Loess Plateau--History.
Water-supply--China--Loess Plateau--History.
Princeton subject headings: