00817nam 2200157z- 450 9910712890503321(CKB)5470000002497274(EXLCZ)99547000000249727420230509c1977uuuu -u- -engAnalysis of technical issues relating to California's request for waiver of federal preemption with respect to exhaust emission standards for 1979 and subsequent model year heavy duty vehiclesWashington, DCU.S. Environmental Protection Agency, Emission Control Technology DivisionBOOK9910712890503321Analysis of technical issues relating to California's request for waiver of federal preemption with respect to exhaust emission standards for 1979 and subsequent model year heavy duty vehicles3261963UNINA