Columbia subject headings:
Migration, Internal--Africa.
Migration, Internal--Arab countries.
Urbanization--Africa.
Urbanization--Arab countries.
Harvard subject headings:
Migration, Internal--Africa.
Migration, Internal--Arab countries.
Urbanization--Africa
Urbanization--Arab countries.
Princeton subject headings:
Migration, Internal--Africa.
Migration, Internal--Arab countries.
Urbanization--Africa.
Urbanization--Arab countries.