Subject
photo credits: Wikimedia Commons
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Richard Francis Burton
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Sven Hedin
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Joseph Dalton Hooker
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Alfred Russel Wallace
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Ferdinand von Richthofen
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Jacques Cousteau
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Louis Leakey
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William John Hamilton
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August Heinrich Petermann
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Charles Montagu Doughty
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Ranulph Fiennes
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Pyotr Kozlov
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David Attenborough
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Austen Henry Layard
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Francis Galton
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Nikolay Przhevalsky
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James Clark Ross
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Robert Fitzroy
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Edward John Eyre
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Ralph Alger Bagnold
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Charles Sturt
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Alfred Grandidier
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Harry Johnston
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John Hemming
Subject - wd:Q26268774