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2. U.S. Economy at a Glance;Bureau of Economic Analysis,2020
3. Crisis Management Planning in the Travel and Tourism Industry;Cassedy,1991
4. Daily Updates of Totals by Week and State;Centers for Disease Control and Prevention (CDC),2020
5. Trends in Number of COVID-19 Cases and Deaths in the US Reported to CDC, by state/territory;Centers for Disease Control and Prevention (CDC),2020