Columbia subject headings:
Harvard subject headings:
China--History--Ming dynasty, 1368-1644.
Hebei Sheng (China)--History--Sources.
Tianjin (China)--History--Sources.
Princeton subject headings:
China--History--Ming dynasty, 1368-1644.
Hebei Sheng (China)--History--Sources.
Tianjin (China)--History--Sources.