LEADER 01725nam 2200409 450 001 9910713000203321 005 20200214152122.0 035 $a(CKB)5470000002498186 035 $a(OCoLC)1140650750 035 $a(EXLCZ)995470000002498186 100 $a20200214d1979 ua 0 101 0 $aeng 135 $aur||||||||||| 181 $ctxt$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 00$aPortland study interim analysis: update with nine months of vehicle operation 210 1$a[Ann Arbor, Mich.] :$cEmission Control Technology Division, Office of Mobile Source Air Pollution Control, Office of Air, Noise, and Radiation, U.S. Environmental Protection Agency,$d1979. 215 $a1 online resource (14 pages in various pagings) $cillustrations 300 $a"IMS-004/PS-2." 300 $a"May 1979." 517 $aPortland study interim analysis 606 $aAutomobiles$xMotors$xExhaust gas$zUnited States$vObservations 606 $aAutomobiles$zUnited States$xMotors$xMaintenance and repair$vObservations 606 $aAutomobiles$xInspection$zUnited States$vObservations 606 $aAir$xPollution$zUnited States$vObservations 615 0$aAutomobiles$xMotors$xExhaust gas 615 0$aAutomobiles$xMotors$xMaintenance and repair 615 0$aAutomobiles$xInspection 615 0$aAir$xPollution 712 02$aUnited States.$bEnvironmental Protection Agency.$bOffice of Mobile Source Air Pollution Control.$bEmission Control Technology Division, 801 0$bGPO 801 1$bGPO 906 $aBOOK 912 $a9910713000203321 996 $aPortland study interim analysis: update with nine months of vehicle operation$93334105 997 $aUNINA