UN R81 (1989) Close UN R81 (18 Sep 1989) Download in .pdf format | Close	18 Sep 1989	2011-01-28 17:06:41 UTC
UN R81 (1998) Close UN R81 ( 7 May 1998) Download in .pdf format | Close	7 May 1998	2011-01-28 17:07:42 UTC
UN R81 (2007) Close UN R81 ( 7 Aug 2007) Download in .pdf format | Close	7 Aug 2007	2011-01-28 17:24:56 UTC
Earlier texts may be available through the UN Official Document System.