01744nam 2200409 450 991071300040332120200214151351.0(CKB)5470000002498184(OCoLC)1140650906(EXLCZ)99547000000249818420200214d1979 ua 0engur|||||||||||txtrdacontentcrdamediacrrdacarrierPortland study interim analysis: observations on six months of vehicle operation[Ann Arbor, Mich.] :Emission Control Technology Division, Office of Mobile Source Air Pollution Control, Office of Air, Noise, and Radiation, United States Environmental Protection Agency,1979.1 online resource (30 pages in various pagings) illustrations"January 1979."Chiefly tables.Portland study interim analysisAutomobilesUnited StatesMotorsMaintenance and repairObservationsAutomobilesInspectionUnited StatesObservationsAutomobilesMotorsExhaust gasUnited StatesObservationsAirPollutionUnited StatesObservationsAutomobilesMotorsMaintenance and repairAutomobilesInspectionAutomobilesMotorsExhaust gasAirPollutionUnited States.Environmental Protection Agency.Office of Mobile Source Air Pollution Control.Emission Control Technology Division,GPOGPOBOOK9910713000403321Portland study interim analysis: observations on six months of vehicle operation3334107UNINA