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Anchor text: All-time WBA World champions – reference book

Wikipedia: World Boxing Association

Anchor text: All-time WBO World champions – Reference book

Wikipedia: World Boxing Organization

Anchor text: All-time IBF World champions - Reference book

Wikipedia: International Boxing Federation

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Wikipedia: List of world heavyweight boxing champions

Wikipedia: Julio Gervacio

Anchor text: All-time WBA World champions - Reference book

Wikipedia: List of WBA world champions

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Anchor text: Susumu Hanagata - Boxing Title Fights

Wikipedia: Susumu Hanagata