1962-2011 africa american athor biography civilwar civilwar(sudan:1955-1972) conflictresolution erdölversorgung foreigneconomicrelations george history industry internationalbusinessenterprises internationaleconomicrelations mi13094 national nationalists peace peacekeepingforces peacekeepingforcesunitednations peacekeepingoperations peacestudies petroleumindustryandtrade politicalstability politicsandgovernment qr534 self-determination soldiers sudan