Columbia subject headings:
Harvard subject headings:
China--Economic policy--To 1644.
China--Politics and government.
Land tenure--China--History
Princeton subject headings:
China--History--Han dynasty, 202 B.C.-220 A.D.
China--History--Qin dynasty, 221-207 B.C.
China--History--Warring States, 403-221 B.C.