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Effectiveness of Face Mask or Respirator Use in Indoor Public Settings for Prevention of SARS-CoV-2 Infection — California, February–December 2021 | MMWR
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ASTM Level 3 DT-MSK-003 Surgical Masks
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FLUIDSHIELD N95 Particulate Filter Respirator and Surgical Mask | HALYARD
New ASTM Standard for Face Coverings: ASTM F3502 - MakerMask