Columbia subject headings:
Harvard subject headings:
Agriculture--China--Ningxia Huizu Zizhiqu--History.
Farm management--Ningxia Huizu Zizhiqu--History.
Ningxia Huizu Zizhiqu (China)--History.
Princeton subject headings:
Agriculture--China--Ningxia Huizu Zizhiqu--History.
Farm management--Ningxia Huizu Zizhiqu--History.
Ningxia Huizu Zizhiqu (China)--History.