Columbia subject headings:
Harvard subject headings:
Ethnology--Indian Ocean Region--History--Congresses.
Indian Ocean Region--Emigration and immigration--History--Congresses.
Indian Ocean Region--Population--History--Congresses.
Princeton subject headings:
Ethnology--Indian Ocean region--History--Congresses.
Immigrants--Indian Ocean region--History--Congresses.
Indian Ocean Region--Emigration and immigration--History--Congresses.
Indian Ocean Region--Population--History--Congresses.