Columbia subject headings:
Harvard subject headings:
Chinese essays--220-589.
Chinese essays--Qin and Han dynasties, 221 B.C.-220 A.D.
Chinese essays--To 221 B.C.
Princeton subject headings:
Chinese essays--220-589.
Chinese essays--Qin and Han dynasties, 221 B.C.-220 A.D.
Chinese essays--To 221 B.C.