Columbia subject headings:
India--History--324 B.C.-1000 A.D.
India--History--To 324 B.C.
Harvard subject headings:
India--History--324 B.C.-1000 A.D.
India--History--Early to 324 B.C.
India--History--To 324 B.C.
Princeton subject headings:
India--History--324 B.C.-1000 A.D.
India--History--To 324 B.C.