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Amazon.com: PURIAN Big Mask Adult XL (Extra Large) Beard Mask for Men, Face Mask with Black Straps include Quick Fit Cord Lock Toggles for All Day Use : Tools & Home Improvement
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Under-mask beard covers achieve an adequate seal with tight-fitting disposable respirators using quantitative fit testing - ScienceDirect
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Assessing the effect of beard hair lengths on face masks used as personal protective equipment during the COVID-19 pandemic | Journal of Exposure Science & Environmental Epidemiology
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