References
- Esche , C. A. , Groff , J. H. , Schlecht , P. C. and Shulman , S. A. 1994 . Laboratory Evaluations and Performance Reports for the Proficiency Analytical Testing (PAT) and Environmental Lead Proficiency Analytical Testing (ELPAT) Programs , Cincinnati, OH : National Institute for Occupational Safety and Health . DHHS (NIOSH) Pub. No. 95–104.
- National Institute for Occupational Safety and Health . 1994 . “ Asbestos and Other Fibers by PCM: Method 7400. ” . In NIOSH Manual of Analytical Methods, 4th ed. DHHS(NIOSH) Pub. No. 94–113 , Edited by: Eller , P.M. Cincinnati, OH : NIOSH .