Columbia subject headings:
Harvard subject headings:
Agriculture, Cooperative--China--Ningxia Huizu Zizhiqu--History.
Ningxia Huizu Zizhiqu (China)--Economic conditions.
Princeton subject headings:
Agriculture, Cooperative--China--Ningxia Huizu Zizhiqu--History.
Ningxia Huizu Zizhiqu (China)--Economic conditions.