- NIOSH Pocket Guide
http://www.cdc.gov/niosh/npg/npg.html
Substance specific data and the safety relevant data for more than 900 substances. The pocket guide includes: Chemical Names, synonyms, trade names, conversion factors, CAS, RTECS, and DOT Numbers, NIOSH Recommended Exposure Limits, Occupational Safety and Health Administration (OSHA) Permissible Exposure Limits (PELs), NIOSH Immediate Dangerous to Life and Health values (NIOSH IDLHs)
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