Columbia subject headings:
Harvard subject headings:
Cambodia--History--1975-
Cambodia--History--1975-1979.
Indochina--History--1945-
Political refugees--Indochina
Vietnam--History--1975-
Princeton subject headings:
Cambodia--History--1975-1979.
Indochina--History--1945-
Political refugees--Indochina.
Vietnam--History--1975-