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- United States12
- United States. Congress. Senate. Committee on the Judiciary9
- United States. Congress. House. Committee on Education and Labor. Subcommittee on Labor Standards7
- Bartrip, P. W. J. (Peter W. J.)5
- Institute for Civil Justice (U.S.)5
- Berger, Stephen L.4
- Brodeur, Paul4
- Carroll, Stephen J., 1940-4
- Castleman, Barry I.4
- Garil, Stanley4
- Geological Survey (U.S.)4
- Tweedale, Geoffrey4
- United States. Occupational Safety and Health Administration4
- Virta, Robert L.4
- Clifton, Robert A.3
- Hansen, Philip3
- Rand Corporation3
- SRI International3
- Selikoff, Irving J.3
- United States. Bureau of Mines3