Verrelli, Leonard D., author.
[Ann Arbor, Mich.] : Division of Emission Control Technology, Mobile Source Pollution Control Program, Air Pollution Control Office, Environmental Protection Agency, April 1971.
1971-
Warner-Selph, Mary Ann, author.
[Ann Arbor, Mich.] : Technical Support Staff, Emission Control Technology Division, Office of Mobile Sources, Office of Air and Radiation, U.S. Environmental Protection Agency, July 1986.
1986-