Source: Occupational Exposure Sampling Strategy Manual. DHEW (NIOSH) Publication 77-173. available online at http://www.cdc.gov/niosh/docs/77-173/ Appendix I. pp.97 -105.
Source: Occupational Exposure Sampling Strategy Manual. DHEW (NIOSH) Publication 77-173. available online at http://www.cdc.gov/niosh/docs/77-173/ Appendix I. pp.97 -105.