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Covid-19 2020-08 part two
Covid-19 Transmissibility Outdoors part two

Covid-19 risk under various conditions      web

webhttps://www.sfgate.com/science/article/The-6-foot-rule-is-outdated-Researchers-devise-15520286.php
authorMike Moffitt
publicationSan Francisco Chronicle
date2020-08-28

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