= NIOSH Pocket Guide to Chemical Hazards
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Institutional chemical data published by the National Institute for Occupational Safety and Health. Inspected Specific Gravity fields: https://www.cdc.gov/niosh/npg/npgd0302.html[Glycerin], https://www.cdc.gov/niosh/npg/npgd0577.html[Sulfuric acid, 96–98 percent], https://www.cdc.gov/niosh/npg/npgd0262.html[Ethyl alcohol] and https://www.cdc.gov/niosh/npg/npgd0277.html[Ethyl ether]. Undated data pages as inspected; no modern exposure limits are used in the historical solution.
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