United States. Environmental Protection Agency. Office of Mobile Source Air Pollution Control. Emission Control Technology Division, author.
Washington, D.C. : United States Environmental Protection Agency, December 1975.
1976-
United States. Environmental Protection Agency. Office of Transportation and Air Quality. Assessment and Standards Division, author.
[Washington, D.C.] : United States Environmental Protection Agency, 2010.
2010
[Ann Arbor, Mich.?] : Emission Planning and Strategies Division, Office of Mobile Sources, Office of Air and Radiation, U.S. Environmental Protection Agency, 1994.
1994