UN R40 (1979)
UN R40: Corrigendum 1 (1979)
UN R40: Corrigendum 2-Revision 1 (1981)
UN R40: Corrigendum 3 (1989)
UN R40: Corrigendum 4 (1997)
UN R40: Amendment 1 (1988)
UN R40: Amendment 2 (2007)
Earlier texts may be available through the UN Official Document System.