1. Approval of Respiratory Protective Devices;Code of Federal Regulations Title 42,1996
2. Respiratory Protection;Code of Federal Regulations Title 29 (5),1998
3. Compressed Gas Association: Commodity Specification for Air (CGA G-7.1), Arlington, Va.; Compressed Gas Association; 1989
4. Compressed Gas Association: Commodity Specification for Air (CGA G-7.1), Arlington, Va.; Compressed Gas Association; 1997
5. Formation of carbon monoxide in air compressors