Verrelli, Leonard D., author.
[Ann Arbor, Mich.] : Bureau of Mobile Source Pollution Control, Office of Air Programs, Environmental Protection Agency, May 1971.
1971-
Verrelli, Leonard D., author.
[Ann Arbor, Mich.] : Power Systems Section, Test and Evaluation Branch, Environmental Protection Agency, September 1972.
1972-
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-