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
[Washington, D.C.] : United States Environmental Protection Agency, Office of Air and Water Programs, Mobile Source Pollution Control Program, [1972]
1972