Columbia subject headings:
Desertification--Arab countries.
Rural-urban migration--Arab countries.
Harvard subject headings:
Arab countries--Climate--Congresses.
Arab countries--Emigration and immigration--Congresses.
Desertification--Arab countries--Congresses.
Migration, Internal--Arab countries--Congresses.
Princeton subject headings:
Arab countries--Emigration and immigration.
Desertification--Arab countries.
Water resources development--Arab countries.