1 July R51/R138: Agenda for the 12th (July 2025) session R51/R138-12-01	R51/R138-12-01	2025-07-01
1 July Background on proposal for setting sound limits (OICA) R51/R138-12-02	R51/R138-12-02	2025-07-01
24 June Minutes of the 11th (June 2025) R51/R138 informal subgroup session R51/R138-11-04	R51/R138-11-04	2025-06-24
20 June Minutes of the 10th (June 2025) R51/R138 informal subgroup session R51/R138-10-03	R51/R138-10-03	2025-06-20
20 June Vehicle external sound: Questions to be discussed R51/R138-11-02	R51/R138-11-02	2025-06-20
20 June Proposal for Exterior Sound Enhancement System (ESES) requirements (OICA) R51/R138-11-03	R51/R138-11-03	2025-06-20
20 June Key points on Exterior Sound Enhancement Systems/Exterior Sound Generator requirements R51/R138-11-01	R51/R138-11-01	2025-06-20
19 June UN R138: Proposal for Supplement 2 to the 02 series of amendments GRBP/2025/24	GRBP/2025/24	2025-06-19
5 June Key points on exterior sound enhancement testing requirements R51/R138-10-02	R51/R138-10-02	2025-06-05
5 June R51/R138: Agenda for the 10th (June 2025) session R51/R138-10-01	R51/R138-10-01	2025-06-05
4 June UN R138: Structuring proposal for 03 series (OICA) R51/R138-09-02	R51/R138-09-02	2025-06-04