federal holidays - SERP Analysis

https://www.opm.gov/policy-data-oversight/pay-leave/federal-holidays/

https://en.wikipedia.org/wiki/Federal_holidays_in_the_United_States

https://www.ca2.uscourts.gov/clerk/calendars/federal_holidays.html

https://www.opm.gov/frequently-asked-questions/pay-and-leave-faq/pay-administration/what-are-federal-holidays/

https://www.usa.gov/holidays

https://www.federalpay.org/holidays

https://www.frbservices.org/about/holiday-schedules

https://www.usgs.gov/core-research-center/federal-holidays