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Covid-19 2020-08 part one
Wearning Masks to Reduce Covid-19, July through August 2020

relative Covid-19 face mask efficacy (with video)      web

webhttps://www.menshealth.com/health/a33534200/best-face-masks-coronavirus-viral-video/
authorPhilip Ellis
publicationMen's Health
date2020-08-06

comparing a SINGLE-LAYER bandana ...

Documents:
visualizing face mask efficacy for Covid-19
webSiddhartha Verma a, Manhar Dha...Physics of Fluids2020-06-30

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