01725nam 2200409 450 991071300020332120200214152122.0(CKB)5470000002498186(OCoLC)1140650750(EXLCZ)99547000000249818620200214d1979 ua 0engur|||||||||||txtrdacontentcrdamediacrrdacarrierPortland study interim analysis: update with nine months of vehicle operation[Ann Arbor, Mich.] :Emission Control Technology Division, Office of Mobile Source Air Pollution Control, Office of Air, Noise, and Radiation, U.S. Environmental Protection Agency,1979.1 online resource (14 pages in various pagings) illustrations"IMS-004/PS-2.""May 1979."Portland study interim analysisAutomobilesMotorsExhaust gasUnited StatesObservationsAutomobilesUnited StatesMotorsMaintenance and repairObservationsAutomobilesInspectionUnited StatesObservationsAirPollutionUnited StatesObservationsAutomobilesMotorsExhaust gasAutomobilesMotorsMaintenance and repairAutomobilesInspectionAirPollutionUnited States.Environmental Protection Agency.Office of Mobile Source Air Pollution Control.Emission Control Technology Division,GPOGPOBOOK9910713000203321Portland study interim analysis: update with nine months of vehicle operation3334105UNINA