Washington Metropolitan Area Transit Authority, WMATA, 'COVID-19 Information: Service Changes due to the public health emergency' (page as of May 13, 2020) (Mar. 16, 2020) (Ex. ECO-B-099)
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 (secondary source; Burbio data), Ballotpedia, 'School responses to the coronavirus (COVID-19) pandemic during the 2020-2021 academic year' (July 8, 2021) (Ex. ECO-B-106)
Mayor Muriel Bowser, Mayor's Order 2021-097 (July 29, 2021), indoor mask requirement effective July 31, 2021, applied to schools and child care for 2021-22 (Ex. ECO-B-155)
Ballotpedia (secondary source), Ballotpedia, 'School responses to the coronavirus (COVID-19) pandemic during the 2021-2022 academic year' (Aug. 1, 2022) (Ex. ECO-B-107)
