United States of America
14 Jan 2015 Comparison of Heavy Duty Hybrid Test Procedures Drafted in GTR No. 4 (USA and US EPA) GRPE-70-15 2015-01-14 Status of US EPA program to validate the HILS methodology and resolve error codes. USA US EPA
4 Jun 2010 Comments on the Terms of Reference (US EPA and USA) HDH-02-06 2010-06-04 US EPA USA
29 Oct 2010 Regulation of emissions from commercial hybrid vehicles (USA and Cummins) HDH-03-09 2010-10-29 USA Cummins