OSHA
https://www.osha.gov/silica-crystalline
US Mines Safety and Health Administration
https://www.msha.gov/regulations/rulemaking/silica
https://www.msha.gov/respirable-crystalline-silica-30-cfr-part-60-frequently-asked-questions
AIHA
https://www.aiha.org/taxonomy/chemical-material-hazards/silica
https://synergist.aiha.org/202204-engineering-controls-silica
CDC / NIOSH
https://www.cdc.gov/niosh/silica/about/index.html
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