United States. General Accounting Office
Unknown Author
J. Frederic Walker
Canada. Environmental Protection Service
Beat Meyer
Rongqiao He
L. Vanino
Pamela Hatchfield
Andrew Mackie Held
United States. Congress. House. Committee on Energy and Commerce. Subcommittee on Oversight and Investigations.
Ernest Carl Wagner
Luoping Zhang
Industrial Hygiene Research Laboratory (U.S.)