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National Geographic : 1950 Oct
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©) National Geographic Society 429 Kodacthrome by Kip Ross Indian and Llama, Partners in Peru's High Places, Thrive in the Thin Andean Air This Quechua possesses the huge lungs that highlanders develop to withstand altitudes where airmen use breathing aids. His blood system, laden with extra hemoglobin to absorb oxygen, has more red cells than normal.
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