College football - Wikipedia
Why football at Christmas is a very British tradition - BBC Bitesize
What NFL games have been played on Christmas Day in history? - AS USA
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Why Are There NFL Games on Christmas?
Fifty Years Later: A Raiders Oral History of the Immaculate Reception
The history of the NFL on Christmas Day – The Swing of Things
Why football matches are no longer played on Christmas Day in the UK - Daily Star
Patriots QB Mac Jones could make NFL history against Jaguars
It's snowtime! Your bumper Christmas TV guide, Television
Only in Philadelphia: A look back on the day Eagles fans booed Santa at Franklin Field
When was the last time football matches in Britain were played on Christmas Day?, Soccer
NFL100: When John McDonough called The Longest Game on Christmas Day – Football Zebras