1. Procedure for Establishing a Test of Permissible Gas Masks
2. Respiratory Protective Devices: Tests for Permissibility; Fees;Fed. Register,1972
3. Respiratory Protective Devices: Final Rules and Notice;Fed. Register,1995
4. of Federal Regulations, Title 29 Part 1910.134
5. Code of Federal Regulations, Title 29 Part 1926.103