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Automobile sulfuric acid emission control - the development status as of December 1975 : a report to

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-

Controlling emissions from light-duty motor vehicles at higher elevations : a report to Congress

United States. Environmental Protection Agency. Office of Air, Noise, and Radiation, author.
Ann Arbor, MI : Office of Mobile Sources, Emission Control Technology Division, 1983. 1983