Columbia subject headings:
Bulgaria--Economic conditions--1944-1989.
Communist countries--Economic conditions--Case studies.
Cuba--Economic conditions--1959-1990.
Mongolia--Economic conditions.
Vietnam--Economic conditions.
Harvard subject headings:
Bulgaria--Economic conditions--1944-
Communist countries--Economic conditions--Case studies.
Cuba--Economic conditions--1959-1990.
Mongolia--Economic conditions
Vietnam--Economic conditions.
Princeton subject headings:
Bulgaria--Economic conditions--1944-1989.
Communist countries--Economic conditions--Case studies.
Cuba--Economic conditions--1959-1990.
Mongolia--Economic conditions.
Vietnam--Economic conditions.