Columbia subject headings:
Harvard subject headings:
Hydraulic engineering--China--Yellow River Region--History.
Irrigation engineering--China--Yellow River Region--History.
Water conservation--China--Yellow River Region--History.
Yellow River Region (China)--Regulation--History.
Princeton subject headings:
Hydraulic engineering--China--Yellow River Region--History.
Irrigation engineering--China--Yellow River Region--History.
Water conservation--China--Yellow River Region--History.
Yellow River Region (China)--Regulation--History.