31 December 1997 | Publisher: National Legislative Bodies / National Authorities | Document type: National Decrees, Circulars, Regulation, Policy Documents
24 July 1993 | Publisher: Economic Community of West African States (ECOWAS) | Document type: Multilateral Treaties/Agreements
18 December 1992 | Publisher: UN General Assembly | Document type: Resolutions/Recommendations/Declarations
11 December 1990 | Publisher: National Legislative Bodies / National Authorities | Document type: National Legislation
29 May 1990 | Publisher: Economic Community of West African States (ECOWAS) | Document type: Multilateral Treaties/Agreements
30 June 1989 | Publisher: Economic Community of West African States (ECOWAS) | Document type: Multilateral Treaties/Agreements
8 December 1986 | Publisher: UN General Assembly | Document type: Resolutions/Recommendations/Declarations