Columbia subject headings:
Islamic Empire--History.
ʻUmar II, Caliph, -720.
Harvard subject headings:
Islamic Empire--Politics and government.
Islamic education
Public administration--Islamic Empire.
ʻUmar II, Caliph, -720.
Princeton subject headings:
Islamic Empire--Politics and government.
Islamic education.
Public administration--Islamic Empire.
ʻUmar II, Caliph, -720.