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Surgical Mask w/ Ties- ASTM Level 3, 4 Layer, 99% PFE, Medical Grade, FDA 510(k) Cleared - Defender Safety
ASTM Level 2 & 3 Face Masks - Surgical Face Masks | Air Filters, Inc.
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EPA Researchers Test Effectiveness of Face Masks, Disinfection Methods Against COVID-19 | US EPA
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Social Media Toolkit - Masks | CDC
Five common misconceptions about face masks - BYU Life Sciences
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3 ply: Level IIR medical grade surgical mask Crooked Monkey
Masks and Respirators
