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Newest to oldest, the keywords used are "1421" and "gavinmenzies":

• Could a rusty coin re-write Chinese-African history?
• Kenya: National Museums Defends the Digging Up of Ancient Kingdom
• China, Kenya to search for ancient Chinese wrecks
• Columbus debunker sets sights on Leonardo da Vinci
• Obsession propels scholar on long, lonesome voyage [ Gunnar Thompson ]
• No Chinese ruins in Cape Breton: archeologists
• Were Chinese here first? (china; menzies; 1421)
• Who came first, Chinese or Columbus?
• Adelanto developer's maps could rewrite history [china; menzies; 1421]
• Riddle of a lost Chinese city on the Atlantic coast
• PBS Previews: 1421: the year China discovered America?
• 1421 (Chinese discovery of America)
• Explorer From China Who 'Beat Columbus To America'

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• Ancient Map Of Africa Poses Questions