Incoming Resources
- U.S. Environmental Protection Agency, Office of Air and Radiation, Office of Mobile Sources, Engine Programs and Compliance Division, Ann Arbor, Mich.?, 1998
- U.S. Environmental Protection Agency, Air and Radiation, Office of Transportation and Air Quality, Ann Arbor, Mich.?, 2002
- Office of Air Programs, Environmental Protection Agency, Ann Arbor, Mich.?, August 1971
- Test and Evaluation Branch, Division of Emission Control Technology, Environmental Protection Agency, Ann Arbor, Mich.?, November 1972