Columbia subject headings:
Africa--Commerce--Periodicals.
Africa--Economic conditions--1960---Periodicals.
Industries--Africa--Periodicals.
Harvard subject headings:
Africa--Commerce--Periodicals.
Africa--Economic conditions--1960---Periodicals.
Industries--Africa--Periodicals.
Princeton subject headings:
Africa--Commerce--Periodicals.
Africa--Economic conditions--1960---Periodicals.
Industries--Africa--Periodicals.
Periodicals.