American Industrial Hygiene Association (AIHA)
	Asbestos Institute
	Environmental Protection Agency (EPA)
	National Environmental Health Association (NEHA)
	National Institute For Occupational Safety and Health (NIOSH)
	NIOSH Analytical Methods
	Occupational Health and Safety Administration (OSHA)
	PCM NIOSH 7400A
	OSHA PCM 7400 (PDF for download)