Columbia subject headings:
Harvard subject headings:
Arab countries--Emigration and immigration--History.
Emigrant remittances--Yemen--History.
Foreign workers, Yemeni--Arab countries--History.
Migration, Internal--Yemen--History.
Yemen (Republic)--Economic conditions.
Yemen (Republic)--Emigration and immigration--History.
Princeton subject headings:
Labor mobility--Yemen.
Migration, Internal--Yemen.
Yemen--Economic conditions.
Yemen--Emigration and immigration.