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Photographer Jimmy Nelson spent over four years documenting 29 cultures and tribes at risk of disappearing, often in remote parts of the world, using a 50-year-old camera.
BBC News Picture This looks at his book, Before They Pass Away, a collection of the images he made on this journey.
He makes no apologies for the romanticised portrayal of his subjects, telling the BBC that he set out to create iconographic images in order to celebrate the beauty of these cultures and their traditional ways of life.
Produced by BBC's Colm O'Molloy.
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