Columbia subject headings:
Harvard subject headings:
Ningxia Huizu Zizhiqu (China)--Census, 1990.
Ningxia Huizu Zizhiqu (China)--Population--Statistics.
Princeton subject headings:
Ningxia Huizu Zizhiqu (China)--Census, 1990.
Ningxia Huizu Zizhiqu (China)--Population--Statistics.