Support Letters from the WMO Secretary-General
2015: German support for WMO's water-related programs, 16 December 2015
2004: Supply of historical hydrological data, 8 July 2004
english -- french -- spanish -- russian -- arabic
1996: Support the GRDC, 22 July 1996
english -- french -- spanish -- russian
1990: Surface water runoff data for the GRDC, 18 May 1990
1982: Surface water runoff data set, 11 August 1982