National Geographic investigates
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National Geographic investigates ancient Africa: archaeology unlocks the secrets of Africa's past
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National Geographic investigates ancient Aztec: archaeology unlock the secrets of Mexico's past
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National Geographic investigates ancient China: archaeology unlocks the secrets of China's past
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National Geographic investigates ancient Egypt: archaeology unlocks the secrets of Egypt's past
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National Geographic investigates ancient Greece: archaeology unlocks the secrets of Greece's past
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National Geographic investigates ancient Inca: archaeology unlocks the secrets of the Inca's past
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National Geographic investigates ancient India: archaeology unlocks the secrets of India's past
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National Geographic investigates ancient Iraq: archaeology unlocks the secrets of Iraq's past
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National Geographic investigates ancient Pueblo: archeology unlocks the secretes of America's past
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13)
Animals on the edge: science races to save species threatened with extinction
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