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Holidays and Observances in December - The Spruce
Here’s the full list of December holidays and observances
Federal holidays in the United States - Wikipedia
The Month of December 2023: Holidays, Fun Facts, Folklore
Christmas Day: Date, History And Original Meaning - Calendarr
List of Federal Holidays for 2024 and 2025 - FederalPay.org
Your Full List of December Holidays and Observances in 2022 - Woman's Day
American holidays - USAGov
December - National Day Calendar
Calendar for December 2021 (United States) - timeanddate.com