References
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- Mine Safety and Health Administration . 1995 . Code of Federal Regulations 30 CFR Part 57 Washington, DC : U.S. Government Printing Office .
- Occupational Safety and Health Administration . 1995 . Code of Federal Regulations 29 CFR Part 1926.53 Washington, DC : U.S. Government Printing Office .
- Nuclear Regulatory Commission . 1987 . Code of Federal Regulations 10 CFR Part 20, Table 1, Appendix B Washington, DC : U.S. Government Printing Office .