| UNECE R1/2: Revision 4-Amendment 1 (1994) |
| UNECE R1/2: Revision 4-Amendment 2 (1995) |
| UNECE R1/2: Revision 4-Amendment 3 (1997) |
| UNECE R1/2: Revision 4-Part 1 (1992) |
| UNECE R1/2: Revision 4-Part 2 (1992) |
| UNECE R1/2: Revision 4-Part 3 (1992) |
| UNECE R1/2: Revision 4-Amendment 4 (1998) |
| UNECE R1/2: Revision 4-Amendment 5 (2001) |
| Earlier texts may be available through the UN Official Document System. |