| GRB-56-12 | Proposal for amendments to the proposal for the 03 series of amendments to Regulation No. 51 | |
| GRB-57-13 | Proposal of amendments to document GRB/2013/4 | |
| GRB-57-17 | Proposal for amendments to add Transitional Provisions to Regulation No. 51.03 | |
| GRB-57-20 | Proposal for amendments to UN Regulation No. 51.02 | |
| GRB-57-22 | Japanese proposal on R51 limit values: Rationale for N2 and M3 thresholds | |
| GRB-57-28 | Reducing Vehicle Noise Emissions: Update on the new EU Commission legislative proposal | |
| GRB/2012/8 | Proposal for the 03 series of amendments to Regulation No. 51 | |
| GRB/2012/16 | Proposal for Supplement 8 to the 02 series of amendments to Regulation No. 51 | |
| GRB/2012/17 | Proposal for draft 03 series of amendments to Regulation No. 51 | |
| GRB/2013/4 | Proposal for Supplement 9 to the 02 series of amendments to Regulation No. 51 | |
| GRB/2013/4 | Proposal for Supplement 9 to the 02 series of amendments to Regulation No. 51 | |
| GRB/2013/4 | Proposal for Supplement 9 to the 02 series of amendments to Regulation No. 51 |