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NFHS 2010 High School Football Rules Simplified & Illustrated: The National Association of High School Associations, Bob Colgate: 9781582081250: Amazon.com: Books
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2022 NFHS High School Football Rules by Topic: National Federation of State High School Associations (NFHS), Referee Enterprises, Inc., Bob Colgate, Referee Enterprises, Inc.: 9781582085234: Amazon.com: Books
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NFHS announces seven new rules for the 2022 high school football season - High School Football America
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