Columbia subject headings:
Egypt--History--Early Dynastic Period, ca. 3100-ca. 2686 B.C.
Egypt--History--Old Kingdom, ca. 2686-ca. 2181 B.C.
Grain--Egypt--History.
Harvard subject headings:
Egypt--History--Early Dynastic Period, ca. 3100-ca. 2686 B.C.
Egypt--History--Old Kingdom, ca. 2686-ca. 2181 B.C.
Grain--Egypt--History--To 1500.
Princeton subject headings:
Egypt--History--Early Dynastic Period, ca. 3100-ca. 2686 B.C.
Egypt--History--Old Kingdom, ca. 2686-ca. 2181 B.C.
Grain--Egypt--History.