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Christmas - Wikipedia
Christmas | Origin, Definition, Traditions, History, & Facts
History of Christmas - Origins, Traditions & Facts | HISTORY
Christmas: Holiday Traditions and Gifts | HISTORY
How Christmas has evolved over centuries - National Geographic
Christmas Facts | Britannica
Christmas Through the Ages - World History Encyclopedia
Christmas summary | Britannica
WhyChristmas.com: The Most Christmas Information on the Web
Christmas - National Geographic Kids