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https://historymusings.wordpress.com/2012/02/20/history-qa-february-20-2012-what-is-presidents-day-officially-called-washingtons-birthday-a-brief-history-of-what-you-think-is-presidents-day/
History Q&A February 20, 2012: What is Presidents' Day Officially Called? Washington's Birthday -- A Brief History of (What You Think Is) Presidents’ Day