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The Official rules of the NFL
- "2002-2003 official playing rules of the National Football League"@en
- "1999 official playing rules of the National Football League"@en
- "Official rules of the National Football League"@en
- "1998 official rules of the National Football League"@en
- "Official playing rules of the National Football League"@en
- "Official rules of the NFL"@en
- "2000-2001 official playing rules of the National Football League"@en
- "Official playing rules of the National Football League, 1998"@en
- "The Official rules of the NFL"
- "The Official rules of the NFL"@en
- "2003-2004 official playing rules of the National Football League"@en
- "The official rules of the NFL"@en
- "1998 official playing rules of the National Football League"@en
- "Official playing rules of the National Football League"@en
- "The official rules of the NFL (American football)"