Columbia subject headings:
Flood control--China--History.
Hydraulic engineering--China--History.
Irrigation--China--History.
Water conservation--China--History.
Water resources development--China--History.
Harvard subject headings:
Flood control--China--History.
Hydraulic engineering--China--History.
Irrigation--China--History
Water conservation--China--History.
Water resources development--China--History.
Princeton subject headings:
Flood control--China--History.
Hydraulic engineering--China--History.
Irrigation--China--History.
Water conservation--China--History.
Water resources development--China--History.