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www.orangecountync.gov/Masks
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.png?sfvrsn=426c7e4a_0 "Explainer: Testing the Efficacy of Protective Face Masks")
Explainer: Testing the Efficacy of Protective Face Masks
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Updated COVID-19 Mask Guidelines for Town Facilities - Effective Friday, August 6, 2021 until further notice - Goshen, MA
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Face masks against COVID-19: Standards, efficacy, testing and decontamination methods - ScienceDirect
