Columbia subject headings:
Harvard subject headings:
Ningxia Huizu Zizhiqu (China)--Economic conditions.
Ningxia Huizu Zizhiqu (China)--History.
Taxation--China--Ningxia Huizu Zizhiqu--History.
Princeton subject headings:
Business tax--China--Ningxia Huizu Zizhiqu.
Taxation--China--Ningxia Huizu Zizhiqu.