Amjadi, Azita Reinke, Ulrich Yeats, Alexander Did External Barriers Cause the Marginalization of Sub - Saharan Africa in World Trade? / Azita Amjadi...(et.al) - Washington, D.C World Bank 1996 - 145p. - Policy research working paper . Bound with other working papers as title - No.1 Subjects--Topical Terms: International TradeTrade Barriers - Africa