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2. American football rules - Wikipedia

   en.wikipedia.org/wiki/American_football_rules

   Because of these rules, various leagues of American football have enacted strict rules of uniform numbering so officials may more easily judge which players were eligible and which were not at the start of a play. For example, in college football, ineligible players wear numbers 50–79, while eligible receivers wear 1–49 or 80–99. Even ...

3. List of gridiron football rules - Wikipedia

   en.wikipedia.org/.../List_of_gridiron_football_rules

   A standard football game consists of four 15-minute quarters (12-minute quarters in high-school football and often shorter at lower levels, usually one minute per grade [e.g. 9-minute quarters for freshman games]), [6] with a 12-minute half-time intermission (30 minutes in the Super Bowl) after the second quarter in the NFL (college halftimes are 20 minutes; in high school the interval is 15 ...

4. American football - Wikipedia

   en.wikipedia.org/wiki/American_football

   The first American football game was played on November 6, 1869, between two college teams, Rutgers and Princeton, using rules based on the rules of soccer at the time. A set of rule changes drawn up from 1880 onward by Walter Camp , the "Father of American Football", established the snap , the line of scrimmage , eleven-player teams, and the ...

5. Category:American football books - Wikipedia

   en.wikipedia.org/wiki/Category:American_football...

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6. Glossary of American football terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_American...

   In American football, an unhindered catch of an opponent's kick. The player wanting to make a fair catch must signal for a fair catch by waving an arm overhead while the ball is in the air. After that signal, once the ball is possessed, it is dead immediately and opponents will receive a 15-yard penalty for any contact with the receiver.

7. Category:Books about American football - Wikipedia

   en.wikipedia.org/wiki/Category:Books_about...

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8. Early history of American football - Wikipedia

   en.wikipedia.org/wiki/Early_history_of_American...

   A rematch was played at Princeton a week later under Princeton's own set of rules (one notable difference was the awarding of a "free kick" to any player that caught the ball on the fly, which was a feature adopted from the Football Association's rules; the fair catch kick rule has survived through to modern American game). Princeton won that ...

9. American football in the United States - Wikipedia

   en.wikipedia.org/wiki/American_football_in_the...

   American 7s Football League (A7FL) is a semi-professional league which plays a seven-man version of gridiron football, while the American Flag Football League plays a variant of American football where, instead of tackling players to the ground, the defensive team must remove a flag or flag belt from the ball carrier to end a down.