Education Week (secondary source), Education Week, 'Map: Coronavirus and School Closures in 2019-2020' (Mar. 6, 2020; updated Oct. 13, 2021) (Ex. ECO-B-050)
Ballotpedia (secondary source; student counts from NCES), Ballotpedia, 'School responses to the coronavirus (COVID-19) pandemic during the 2019-2020 academic year' (June 30, 2020) (Ex. ECO-B-105)
Ballotpedia (Lucy Burns Institute), School responses to the coronavirus (COVID-19) pandemic during the 2019-2020 academic year (State-by-State closure chronology) (June 30, 2020) (Ex. SEC-15-001)
