Columbia subject headings:
Harvard subject headings:
China--History--Spring and Autumn period, 722 B.C.-481 B.C.
China--History--Warring States, 403 B.C.-221 B.C.
Princeton subject headings:
China--History--Spring and Autumn period, 722-481 B.C.
China--History--Warring States, 403-221 B.C.