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The pictures for sale and the envelope with drawing on.
The first photographs showing what is believed to be the famous 'Yeti' have emerged for sale.
British explorer Eric Earle Shipton took the historical pictures in 1951 when he was trekking at 19,000ft in the Himalayas.
He spotted the mysterious 13-inch footprint in the snow and his iconic photograph caused a global stir, which has divided explorers and historians for decades.